Holley vacuum secondary not opening. Right now I can feel when the secondaries open Jet the carb for an air/fuel ratio between 14 This Holley Carburetor Features: Vacuum secondaries for use on wide variety of vehicles 2,040 CUD35481 Your vacuum secondaries are on demand so to speak D On a Holley carburetor, the needle and seat are on the top of each float bowl and can be removed and cleaned Holley, Double Pump Carburetor, 750 cfm The best known carb for all racing The Holley double pumpers have a secondary power valve, and the secondary one is commonly plugged Single feed fuel inlet for easy installation; 100% wet-flow tested by Holley technicians to assure it arrives ready to run! TRUCK AVENGER CARBURETOR For P/N 0-90470, 0-90670, & 0-90770 INSTALLATION, TUNING, AND ADJUSTMENT MANUAL The carb is a 750 cfm Holley 3310 4 bbl with vacuum secondaries 99 A secondary metering block allows a tuner to easily replace secondary jets The engine is a 289 in a 65 fastback with 600 cfm holley vacuum secondary, melling cam 10:48 AM Features dual accelerator pumps, mechanical secondaries, dual metering blocks, center hung floats, dual feed fuel inlets, manual choke, power valve blow-out protection and a classic dichromite finish Each Holley power valve is stamped with a number to indicate its vacuum opening point Accelerator pump passage is open Only show this user This page is an article from Hot Rod Magazine, June 1986, an article called "Family Ties" that compares the Ford / Holley 4180 to the generic Holley 4160 600 CFM vacuum secondary carburetor You can change the springs and change the opening moment Connect a vacuum gauge to a manifold vacuum source on the engine Holley The secondary system of a Holley four-barrel carburetor can be either vacuum or mechanically operated RPM is only a few dollars more, and offers the outstanding performance and response from idle all the way to wide open 5 in Features: Gold Dichromate finish for corrosion resistance and … Edelbrock Holley 125-85 Single-Stage Standard Flow Power Valve Opening Vacuum: 8 Part Number: 510-135-4 Different springs will control the opening This tunnel ram is set up with a pair of 0-1850 600-cfm Holley vacuum secondary carbs The same engine/carb combination in a Mike, with your carb on the bench, take your air compresor hose and blow air through the primaries Finally, Holley also makes a The way it works is by drawing fuel and air into the engine by way of a vacuum that is created while the engine is running Most books on Holleys I've read and instruction sheets from Holley which accompany their secondaries spring kit distinctly say to NOT remove the check ball or the action of 4160 carb was rebuilt with new vacuum diaphram Holley makes about 4 different diaphragms Also with the car off make sure secondarys can open See all 12 photos The HP 750 vacuum secondary is set up right, and works great, but not having a choke on it and the air gap intake, during the few cold days in Cali it take a long time to warm up … Discussion Starter · #1 · May 19, 2009 sku: 330887156130381 Holley 0-80783C Vacuum Secondary 650 cfm Carb The carb on the left is a Quick Fuel 650 cfm with vacuum secondaries, while the monster on the right is a 1050 cfm Holley Dominator Lightly seat the mixture screws by turning clockwise Click image to zoom All 4150's have dual accelerator pumps, and dual fuel inlets hence the term "double pumper The often-perceived reduction in performance because of secondaries that do not open right away is mostly a myth Connect the linkage back up I don't see any reason to pay up for Troubleshooting Your Holley Carb – RacingJunk News Vacuum Secondary Tuning As the primary side opens, the air velocity flowing into the intake manifold increases with the engine rpm I'm running a progressive setup, so mainly run Unhook the vacuum linkage, put a small washer on the linkage and then put a small o-ring on Holley, Double Pump Carburetor, 650 cfm The best known carb for all racing The CF for a Comp Cams street roller (248 degrees at 0 Turn them all the way in and turn them back out 1 and a half turns 57 and 58) is a downdraft, two-stage carburetor 20 6 left in stock by Speed demon from It's been a while but after completely rebuilding carb and reinstalled found that four barrel wasn't opening tryed to by local but unavailable or was cost of kit got part cheap and shipping Here’s what you need to do to get those secondaries to work: Open the secondaries by hand with the engine off Only a mechanical secondary carb will have an accelerator pump like the primary side Holley and Service Parts Lists and Typical Views It features exploded diagrams and parts identification tables for each type of Holley carb up to that Take the top off and see if the diaphragm is okay and the check ball is in Tech Tip #1 IMO, for street use, the best combination will use a VACUUM operated carb Edelbrock 1906 AVS2 Carburetor 650 … Vacuum Secondary 650 cfm Carb Discussion Starter · #1 · Mar 22, 2009 e Bill,the internal port for the vacuum diaphram operates on venturi vacuum,very different than ported or manifold This makes your secondary opening rate all messed up, because the spring is not acting on the diaphragm correctly Plus, they have extra parts related to carburetor calibration that is required in order to Holley 0-80319-1 Model 4160 600 CFM Four Barrel Marine Carburetor with Vacuum Secondaries - Application: Ford 351 CID V-8 This kit includes 7 color-coded secondary springs (white, tall yellow, short yellow, purple, plain, brown, black, with white being the softest and … Part Number: 3310S2 "75" indicates in Make sure the choke plates are opening fully While all the Holley carbs being discussed are all Holley Holley Vacuum Secondary Components But at least the Apr 5, 2009 Too my surprise, it looked as if the secondary barrel had not been used in years For some reason the bigger (670 cfm) carburetor works well with a softer vacuum capsule spring It didn't leak I believe that the check ball is indeed a "speed bump" for vacuum When you check the clip it should have moved down the shaft because the diaphram would have contracted under vacuum pulling the shaft up To eliminate this problem, you can adjust the secondary opening screw to allow the secondary throttle plates to be cracked open a Holley 465 cfm four barrel vacuum secondaries with chrome metering block 4150 changeable secondary jets throttles tight brand new accelerator pump assembly reuse able gaskets fuel bowls and blocks 59 primary secondary, 25 discharge nozzle, 107 116 throttle plates plated allows changing the for greater tuning Buy It Now Additional Even if your application is not open or the device is not connected to your system, it will give you i have a brand new holley 4160 , 390cfm carb with vacuum secondaries i cant seem to get the secondaries to open up when i press the throttle to the floor I dipped the carb and replaced the torn diaphragm 25 415$25 How to hook up vacuum lines for holley 600 cfm The answer rounds up to 1,040 Now, if Vacuum is a steady 18 Holley 4160 carburetors w/ vacuum activated secondary 135-4 135-2 135-11 Vacuum Secondary Diaphragm Carburetor Repair kit Accessories for 390-750 CFM 1841849, 1850, 3310, 6619, 6909, 8007, 9834, 80457, 80463, 80508, 80529 4 I got it used and rebuilt it when I rebuilt my engine ~5 or 6 years ago Listed below are just some of the additional components or: This Site is best viewed in IE7 or newer and Firefox 3 or newer That is because vacuum secodary carbs do not have accelerator pumps like the primary does Observe WOT vacuum, should be between Look into the carburetor on the primary side and locate the small hole (arrow) in the body In all the Holley rebuilds I have done the instructions always tell me "not to remove this check ball Turning the screw counterclockwise (F) will open the secondaries quicker Vacuum gauge attached to the intake manifold Likewise a carburetor with vacuum secondaries will only open the secondaries enough to feed the engine what it needs Be Best Price Holley 0-80508S Model 4160 750 CFM Square Bore Vacuum Secondary Electric Choke Replacement Excellent savings Holley 0-80508S Model 4160 750 CFM Square Bore Vacuum Secondary Electric Choke Replacement testimonials, you can try to look for product information I think the question is are the secondaries capable of opening all the way What you are feeling is actually Let’s assume we have an average 350ci small-block Chevy making around 450 horsepower with an older Holley 750 vacuum-secondary carburetor, mild cam, dual-plane intake, and headers I have a 750 holley vacuum secondary in my street/strip truck My white '74L came with a model 3310S Holley 750 vacuum secondary carb You might try a 600 CFM (1850) and see what the paper clip does See More Specifications | Check the Fit - 1000 cfm Holley HP series vacuum secondary, BG billet base plate - Mallory Unilite 14 initial, 24 mechanical in by 2800, ported vac advance (tightened up to only add 4 degrees more as an experiment) Opening your idle bleeds from (Note: the degree of opening of the secondaries can be ascertained by putting a clip on the secondary throttle rod Do not soak the choke pull-off or fast idle cam in the carb cleaner I just picked up a Holley List #3607 vac secondary carb Not sure if this model has this feature; however, I'll mention We show you some simple tip and tricks to troubleshoot and fine tune you vacuum secondary If the opening rate of the vacuum operated secondaries is properly calibrated there should not be a “kick-in-the-pants”; only a smooth increase in power should be felt Just pulled it off a few months ago Vacuum secondary operation depends on spring pressure and intake manifold vacuum at wide-open throttle Secondary on carb(s) not opening For example, the number "65" indicates that the valve will open when engine vacuum drops to 6 Rich-L79 #2 Websearch "Holley gear drive secondary" and look at pictures for some LOL Was guided to the 20-28 replacement covers to equalize the vacuum between the two housings - now neither open holley 3310 on perf rpm air-gap 406 10 Electric Choke Vacuum Secondaries-4160 trying to fix all the errors of the previous carb tuner, set your carb up Blower belt comes off or slips 047" Holley Fuel Pump Mechanical - 110 GPH, 6 Holley 4160 4 Barrel Ultimate Carb Rebuild Kit: Vacuum Secondary Jets for the Holley carb are readily available from Holley at most speed shops 14 The term is sometimes colloquially shortened to carb in the UK and 650 VACUUM SECONDARY HOLLEY CARBURETTOR SPREAD BORE GIF by Hank O’Hop We are proud to announce the newest member of our carburetor family- the Street Warrior It has had the choke tower milled off and looks like the last rebuild was with good parts but it has been sitting so plan on rebuilding it Single feed fuel inlet for easy installation; 100% wet-flow tested by Holley technicians to assure … The first step is to remove the choke pull-off, fast idle cam, then remove and disassemble the vacuum secondary diaphram I was driving my sons 70 Ranchero and it has a 351C with a holley 600cfm car Both the '66 shop manual and the re-build kit I am using say to "drop the secondary discharge ball check into the Vacuum secondaries operate on venturii vacuum - actually airflow through the primaries opens them by exposing a small hole just above the vena contracta The secondary throttle plates are operated by the secondary diaphragm using vacuum Part/Accessory Type Mechanical Part problem is the vac secondaries NEVER open There are washers under the secondary diaphragm cover to leave an air gap so it could move freely 26 The engine is exposed so I can watch what happens under a load and not the slightest bit of movement of the secondary throttle shaft Bendix-Technico (Stromberg) 1-barrel downdraft carburetor model BXUV-3, with nomenclature Often referred to simply as the “double pumper,” the 4150 and 4150-style carburetors fuel-feed inlets and a second full metering block on the secondary side, giving it dual accelerator pumps Smaller sized accelerator pump squirters will … This is a Holley 3310 dual line vacuum secondary carburetor If a complete carb is ordered, a new Aluminum Brand New Holley 750 CFM Classic Carburetor with Electric Choke, Vacuum Secondaries, Shiny Finish, Model # 4160 (Part #0-80508S) Compensate for all vehicle weights, gearing & transmissions to allow smooth opening of secondaries; Dual feed fuel inlets for constant high volume fuel delivery; Compatible with GM, Chrysler, and Ford A/T kickdown Likewise a carburetor with vacuum secondaries will only open the secondaries enough to feed the engine what it needs It Takes only five AED Carburetor Kits to cover virtually all Holley performance carburetors / which greatly reduces inventory and makes kit matching extremely easy Prev Once above 160 degrees, turn the idle speed screw so that the idle is about 50 RPM below your target idle speed set in step 1, above fits model: 750 What this means for 1,177 Posts Gerard > > At a yard sale, for five bux heh heh heh, I picked up a marine 4150 vacuum > secondary *850* CFM Holley It didn't boost performance of the motor by 50 HP, but then it's a secondary diaphragm, not a bottle of nitrous 2:1 solid roller 240/248 @ 0 valve is stamped with a number to indicate the vacuum opening point See all 4 photos Upgrade your browser for free I have a Holley 4160 (I believe) which has a vacuum secondary system that isnt working I used to get 300+ HP from a 351C with a torque cam and 600 cfm Holley vacuum secondary carb, yet get 19-20 mpg in the highways AU $54 Power valve blow-out protection adds trouble free operation; Single feed push-on style fuel inlet with vacuum secondary type; Dichromate finish with side-hung floats; Provides maximum performance on street and mild race vehicles Vacuum secondary-actuated four barrel Holleys (left) do not require an accelerator pump circuit on the secondary side Engine won’t rev very high #8 · Apr 29, 2015 Holley 4 barrel carburetor troubleshooting 065 Also you can unscrew the cap on the vacuum can and look for tears in the diaphram 5 inches of mercury vacuum Pit Stop USA has Carburetors and Components like Holley Vacuum Secondary Diaphragm - Carburetor Model Numbers R1848-1/R3220/R6299-1/R8007 at low everyday prices 1 look on the rear passenger side of the passenger side primary bore and you will see a very small opening This is not a valid test of the functionality of the secondaries More than 1 Look into the top of the carburetor while the car is idling This is done similarly as is done on the Holley 4V carbs except the air stream is being run past that brass tube coming off of the top cover Find many great new & used options and get the best deals for Holley 600 CFM Classic Electric Choke Vacuum Secondaries-4160 Carburetor at the … A i cant seem to find any vacuum leaks or any thing that … Quick-Checking Holley Vacuum-Secondary Operation Holley 0-8007 Model 4160 390 CFM Square Bore 4-Barrel Vacuum Secondary Electric Choke New Carburetor 60 The secondaries are reliant on the opening of this door Usually, when you can't Yesterday I did the paperclip trick where you can see if the vacuum plunger is moving and how much For example, the number "65" indicates that the valve will open when engine vacuum drops to in Compensate for all vehicle weights, gearing & transmissions to allow smooth opening of secondaries Call 800 Engine has vacuum at low RPM Location: California Consequently, on a street driven vehicle, a split plenum intake with a vacuum secondary carb is the way to go Because Holley chose to implement the ported vacuum on the secondaries (instead of the primaries) this progressive link is likely going to … This site is not affiliated with Holley AU $891 No, the car has been running great, I'm just dialing it in 7 rods, HEI/MSD module long tube headers/H-pipe/dual exh 4spd muncie etc by Tuner » Sun Nov 10, 2013 9:19 pm The Quick Fuel housing eliminates the check ball and replaces it with a screw 4160 Holley’s only use a power valve on the primary side because the secondary side is controlled with a jet plate With the engine off, hold the throttle wide open; this drops a lever with a 1/4-inch screw in it beneath the choke housing vacuum is not sufficiently strong to open the … The Holley Four-Barrel Carburetor (Figs North of Seattle, near the "Four-Eye-Field-of-Dreams" The size of the secondary throttle blade also meant that a larger vacuum diaphragm was needed for it to open Holley Vacuum Secondaries HOLLEY 10569 This is one of the simplest ways to get more performance from your engine 600 CFM STREET WARRIOR CARBURETOR If the vehicle is light and the engine … I had a '71 Dodge Charger 500 and used a Edelbrock (aka "Eddy") Torker II and a Holley 4150 R-3310-1, 780 CFM vacuum secondary carb The engine idles at 13 inches of vacuum, there are no vacuum leaks, and the engine is equipped with an excellent ignition system with 14 degrees of initial timing This is the Holley 4150 carburetor with a secondary adjustable-metering block Overview valves is available to “time” this system’s operation to your specific With the vacuum secondary, the engine "tells" the secondaries when to open by the vacuum signal If this looks OK - -my next suggestion is to disconnect the gas pedal linkage 40 It fit in the carburetor Changing the spring allows you to adjust how much vacuum is necessary to open the secondaries Starting with one idle mixture screw, turn it until you get the highest manifold vacuum reading on the gauge Here's what Holley says to do: The secondaries will not open by free revving the engine Considerable mystery surrounds the tuning of the secondaries on a Holley carb Learn more PUsh the throttle to full position and see if you can then maually open the secondarys This allows the secondary bowl and metering block to be more easily removed Com /a > Holley carb Identification - carburetion our carburetor family- the Street Warrior Your Roch was probably 450-500cfm, you're gonna gain very little Hg or below Sputtering at high RPMs usually indicates that you are running too rich (a flat spot, hesitation, or surging usually indicates that you are running too lean) I've removed the vacuum canister and confirmed it is functional One person found this helpful I would change the spring as I previously mentioned Reconnect the appropriate vacuum hoses to the carburetor, noting the correct fitting from Figure 6 and 8 With the vacuum-secondaries, diaphragm springs are used to control opening speeds Mechanical secondaries are linked directly to the accelerator pedal and can get poorer fuel mileage than a carburetor with vacuum-secondaries A tip about vacuum secondary diaphragms Autolite 4100 4 Barrel Carburetor Secondary Circuit Holley secondary's won't open Part Number: 3213-03287329 I shut the motor off, closed the secondaries, re-start and all is well until the next WOT HOLLEY 10569 Carburetor Block Cfm In fact, it is not at all complex, but it can be time consuming Why are HOLLEY 4180 enough of … The secondary vacuum is completely a function of airflow velocity through the primary bore Slide the o-ring and washer all the way up against the vacuum housing 5 and 1 Another worthwhile upgrade while your Holley is apart is to replace the brass fuel level floats with these Nitrophyl floats Vacuum secondaries for use on wide variety of vehicles I am not worried about gas mileage, i want performance Model 4160 carburetors are almost always vacuum secondary designs, but manifold vacuum does not actuate the vacuum secondaries Rebuilt everyting back to the factory specs listed in my Vacuum - The secondary blades are attached to a vacuum diaphragm by a rod Do the same thing with the other … Holleys are rated in cfm and four-barrel carbs range in size from 390 cfm all the way up to the monster Dominators that can flow up to an astonishing 1,475 cfm 510-20-13 Assorted Springs (tuning) 9 The engine needs to be under a load before they will open Classic Holley Carburetor - Part Number 0-3310C (03310C) by Holley Stop browsing in the dark This rather modest signal is amplified by the large diaphragm & used to open the secondary barrels as buffered by a spring in the diaphragm housing of the air horn) The Edelbrock Thunder Series (500, 650 and 800 CFM) are similar to the Performer series, but with a few variations such as an adjustable opening rate secondary Remove the air cleaner Joined Feb 13, 2003 · 2,972 Posts A lighter spring will allow the secondary throttle plates to open more quickly It features side hung float bowls, a universal throttle lever, vacuum secondaries, and an electric choke vacuum opening point If you believe the secondaries are not opening, or are causing a bog when they do, the first thing you need to do is tie them closed Single feed fuel inlet for easy installation Re: Vacuum secondary Holley with 4 corner idle I was suspicious so used the paperclip trick (paperclip I have verified the secondary's won't open Neil Brand New 5 inches For about $30 Free carb cap (52012) This tech paper will discuss basic set-up and tuning of Holley vacuum secondary carbs for optimum street performance and drivability Ok, so Im a complete newbie with Holley carbs, but Im far from incompetent I would hope, haha Secondary transfer slot A stock (or nearly stock) 302 in a light weight car like the Tiger won't open the vacuum secondaries very much on a 600 cfm carb With the carburetor upside down, locate the small brass slotted screw on the underside of the carb 5 On a different … Mar 22, 2012 Previous image Once the screw is fully closed, turn the same screw counter-clockwise one and a half turns The vacuum signal stays high for good throttle response at low and mid range rpms 100% wet flow tested and calibrated 28 If you want to be in total control, then get a mechanical secondarie carb and stop the fooling around 125" in diameter with an internal 0 (Incase yours is leaking or has a hole) for 8 VACUUM SECONDARIES: There are a number of ways to tune the moment when the vacuum secondaries open on a Holley four barrel carb Do the paperclip test to see if the secondaries are opening C $53 If you are still uncertain if they are opening or not you can take a normal paperclip and clip it onto the secondary diaphram rod A competition or race engine which has Holley 4160 Carburetor Vacuum Secondary Analog Super-Tuning Kit made by Speedway Motors, for as low as $51 Half the people in … Holley secondary speed screw Self-built 408W, AFR 195 heads, Performer RPM Intake, Quick Fuel 750, 407rwhp, 479rwtq Hg, etc 4 Barrel Holley Carburetor Diagrams ~ welcome to our site, this is images about 4 barrel holley Vacuum secondaries for use on wide variety of vehicles -6 I believe that's mainly for a 1:1 dual quad setup Try pushing the secondary air valve (top rear butterflies, the big ones) open with your finger while the engine is running Have you replaced the diaphragm? Do you have a 4160 carb? Any modifications? Also you will not see gas being squirted when you open the secondaries Look into the carburetor on the primary side and locate the small hole (arrow) in the body 919 Posts Fig EDIT-If your motor is stock the secondaries may not open but half or less The Road Demon 625 targets mild performance V8 engines from 302 to 460 cid, and rated at 250–350 horsepower if you have a 28, go to a 31, etc An 85 power valve opens at 8 Holley makes a special open style cover (PN-20-59) that makes spring changes quick Post Jan 12, 2017 #24 2017-01-12T18:33 In your opinion would you think the large orifice is because a smaller carburetor with less air flow has a hard enough time getting the secondary's full open But, when you double them up on a dual … Vacuum Secondaries for use on a wide variety of vehicles Quick Change Secondary spring cap lets you choose the opening rate of the secondary barrels Four vacuum ports Holley Accelerator Pump Diaphragm 50cc, Rubber, Petrol only, Suit Holley, Barry Grant, Demon Not recommended for alcohol based fuels Street carburetors perform well with vacuum secondaries, as the secondaries only open when there is demand for additional air Holley 20-59 Quick Change Vacuum Secondary Housing Kit Package list: 1x carburetor, 1x gasket, 1x air filter, 1x pre filter, 1x spark plug, 1x fuel filter, 1x fuel shut-off valve, 6x hose clamp, 1x fuel hose $14 Even though one may look just like another, the link length can vary Each Holley power valve is stamped with a number to indicate the needs I'm using the 750 but it doesn't run as well with the 750 Now turn them out 1 025 accelerator pump nozzle 00 - $415 We locate and promote products from a wide range of Holley Resellers and Vendors 3:1 (lambda 1 Make sure to lube the drill bit and go easy, it is easy to break a bit drilling this hole J ” Due to the fact that no two cars (and no two carburetors) are tuned exactly alike, Holley offers a kit under part number 20-13 that is designed to fine-tune the secondary Turn the screw clockwise (S) will slow the opening rate Holley offers two different metering block conversion kits Description: SMI - STAGE TWO - 3310 (750 CFM) 4160 HOLLEY FOUR BARREL: Our Price: $849 If opening the secondaries does not work, then you may have to drill Oct 23, 2021 Linkage binding It allows the secondaries to open smoothly to prevent stumbling They have air valve type secondaries, so they can offer decent performance and economy The metering rods lift and allow fuel flow from the secondary jets The engine is a 289 in a 65 fastback with 600 cfm holley vacuum secondary, melling cam i have a brand new holley 4160 , 390cfm carb with vacuum secondaries How to know if your vacuum secondaries are opening Visit our showroom to setup an appointment to have your Corvette tuned, accessorized File off some material above the large vacuum port at the rear of the carburetor base plate " The difference between vacuum and mechanical secondaries is simply in how the carb actuates the secondary metering system Holley carbs usually have several vacuum ports on the base When you crack the throttle, the secondaries wont open until the vacuum is high enough to pull them open Add To Cart Write a review I wish still had it Only 1 left in stock (more on … The kits contain all of the necessary parts to do a complete rebuild on your Holley carb, including a vent baffle, high-flow needle, and seat assemblies, high-capacity power valves, pump cam, and secondary opening spring assortments, gaskets, and O-rings For example, the number “65” indicates that the power valve will open when the engine vacuum drops to 6 27's and Fox conversion 95 Click to see full answer It stumbles off the line and i have recently rebuilt Find Holley Carburetors 750 CFM, Vacuum Secondary Type and get Free Shipping on Orders Over $99 at Summit Racing! Summit Racing SpeedCard - Open a World of Possibilities - Apply Today! Square Bore, 4-Barrel, Vacuum Secondaries, Dual Feed, Aluminum, Polished, Each Step 1 This will base line you 31 0 out of 5 stars 75 inches at idle with manual trans Or: Instructions and a special plug to convert your Holley Vacuum Secondary Carb to a 3 BBL for improved fuel mileage and response Blew some carb cleaner back thru the hole and verified Yes, a 600 cfm will be good for 300+ HP easily Our comparison photo between the two styles illustrates the difference in external appearance From my experience with vacuum-operated secondaries on Holley carbs, the usual culprit is lack of vacuum either due to a torn/non-sealing diaphragm, blocked vacuum port in the secondary bore, or torn/missing cork gasket between the main body and the vacuum secondary diaphragm unit Next image 510-20-59 Quick Chang kit (allows flip of a lever spring changing A carburetor ( American English) or carburettor ( British English) is a device that mixes air and fuel for internal combustion engines in an appropriate air–fuel ratio for combustion Mid 60's Chevy stuff you need to direct the air from your … I'm troubleshooting a 600 cfm remanufactured Holley with vacuum secondaries Blower drive belt is slipping 4 I verified this twice by using both the bread tie and the paperclip tests (putting each on the vacuum pot shaft Re: holley 3310-4 secondary not opening On the left side there is a mechanical linkage that connects the primarys to the secondaries 750 Holley Vacuum secondaries and electric choke Power Valves At the diaphragm housing on the rear those passages are 0 Doug Go the other direction to Make sure it is snug to the bottom of the housing 99 7:1 and 15 Vacuum secondaries for use on wide variety of boats $38 Holley’s 600 cfm (model 0-80457C) is a vacuum secondary carb The Holley instructions state to use a lighter spring until you feel Secondary actuation on a 4100 is by a vacuum diaphragm fed through vacuum passages drilled into the body and cover Holley carburetors utilize Go Start with about Post $24 Our performance and installation facility is open Monday-Friday from 8:30am-5:30pm (EST) When removed, you’ll see that the screw (Fig 1) will have a long stem on it which we will discuss again later After taking the engine to 5000rpm the clip hadn't moved Mark each hose when you remove it from the original carb (quadrajet?) Hoses that attach to the baseplate are at full vacuum and should be returned to a similar location or to the manifold, using a "tree" Vacuum secondaries are more fuel-efficient because they do not open until the engine needs more fuel However if you plan to replace the production 2- or 4-barrel carb, this is one of the most popular choices 5" or below Then remove the four screws from the vacuum diaphragm housing on the passenger side of the carburetor Double check for vacuum leaks at the carb Adjust the Opening Point of Vacuum Secondaries The opening rate of a vacuum secondary system is controlled by the diaphragm spring located in the vacuum secondary diaphragm housing The stock spring that comes in the 3310 will never let the secondarys open Comments: The secondary throttle shaft is actuated by a link off the primary shaft that hits a lever on the secondary throttle shaft 00 plus shiping you can fix your problem Be safe, schick Take her for a run up to 2000-2500 rpm and then floor it Blower displacement is too small for application It can be considered as two, dual carburetors; one supplying a fuel-air mixture throughout the entire range of engine operation (primary stage) and the other functioning only when a greater quantity of fuel-air mixture is required (secondary stage) These classic Holley 4 barrel carbs features all metal parts and vacuum secondaries When attaching vacuum lines, you need to remember only one thing Holley etc 5 - 8 PSI, 1/4 Inch NPT, Chrysler Small Block, HO12-360-11 Features dual accelerator pumps, mechanical secondaries, dual metering blocks, center hung floats, 4-corner idle system, dual feed fuel inlets, manual choke, power valve blow-out protection and a classic dichromite finish Ships from and sold by Amazon -Quick Fuel Technologies secondary diaphragm housing Verified purchase: Yes | Condition: new | Sold by: rburchfield55 (0) (0) 90151 : Carburetor, Holley 4bbl 750CFM Vacuum Secondaries Secondaries open based on airflow, not vacuum Scott Crouse Writer When vacuum reaches a certain point the secondary operating diaphragm kicks in You can drill a bleed from the curb idle passage in the body into the bore, # 3 in the top picture I've tried everything including changing out the return spring, blowing out the vacuum port, etc When the vacuum gets high enough, it overcomes the tension of the spring and moves the diaphragm I have a rebuild kit and several extras gaskets but the box is open and i don't know what's missing ready-to-run carb, so the jetting, pump cam, shooter sizing, and spring This carburetor was purchased new, and was fully rebuilt with care and tested on my 72 Mustang (302 cubic inch engine) The 4160 version replaces the metering block with a thinner metering plate that uses fixed jets 56 5 power valve I had a 735 Holley (OEM 428 Ford carb) on my 455 Olds powered jet boat and the secondaries never opened Attempts to back down off WOT runs, the boat won't idle below ~1800 RPMs ca Attach a vacuum gauge to a manifold vacuum port on the throttle body Tell him to line up the holes in the … It opens when a vacuum is created to enrich fuel flow to the engine under varied vacuum conditions If we open it at the right time and the right rate for the vacuum secondaries, the carb delivers a … The opening rate of the vacuum secondary system can be tailored by changing the spring inside the vacuum housing #8 · Apr 2, 2016 I used the paper clip on the linkage and it didn't move Fuel delivery problem Buy in monthly payments with Affirm on orders over $50 Before you go Holley 1850 Carb, 4 barrel, 600cfm with vacuum secondaries and intake 1; 2; 2 of 2 Go to page 065 / 2 x 1,728=1,039 FREE Shipping Find Holley Vacuum Secondary Diaphragm Housings and Covers and get Free Shipping on Orders Over $99 at Summit Racing! Holley vacuum secondary diaphragm housings and covers are designed to replace your existing cover without any modifications We’ve added Holley’s 2×4 Quick-Change housing kit that includes small nipples on each lid that connect a vacuum hose between … The other option is to bench test the secondary operation Place your spout of empty gas can close to the opening of your Holley (use caution as a small amount could overflow) 067 to … For this story, the tips are based on applications using a Holley 4150/4160-type vacuum-secondary four-barrel (the non-Dominator-type), but most are applicable to other popular carburetors – even singe- or two-barrel models, as well To be used with a OPEN plenum intake design But don’t lean it out to the point where the engine begins to stumble Dual feed fuel inlets for constant high volume fuel delivery; Ford A/T kickdown; Vacuum Secondary Diaphragm Carburetor Numbers R1848–1 R3220 R6299–1 R8007; rod length is 2 JakeInAZ 6 As the primary throttle valves are opened the vacuum at the venturi increases Less than Hg or Like the Q-jet and Holley vacuum secondary carbs, they are good for mild builds/daily driver Part Number: 14086-03287329 Here's a link from the Y-Block forum discussing how to check the vacuum secondary operation for the Holley carbs 2 Circuit Metering Spray some WD 40 along the intake where it meets the heads and see if your engine idle changes The diaphragm is held in place by a spring You cannot normally get the vacuum secondaries to open by flicking the throttle and rev’ing the engine with the car in neutral hole to connect throttle linkage at a lesser radius since using the outer hole doesn't actuate throttle enough to even open the secondaries Had on my 454, started right up and ran good Product Q&A View Now Too little, and they open too quickly causing a significant fl at spot 040” and go up one drill bit at a time Opening the secondaries too late reduces power and opening it too soon hinders torque, so this leads to one obvious conclusion WOT – Anything over about half throttle reduces manifold vacuum to a point where the power valve should open Carburetor Parts On Sale Like is used on Chevy inline 6 intakes Open Box - Blemish Parts 100% wet-flow tested by Holley technicians to assure it arrives ready to run! Compatible with GM, Chrysler, and Ford A/T kickdown linkage Inside the vacuum secondaries' diaphram housing is the port which transmits the vacuum signal from the main carb to the diaphram which activates the secondaries Have you replaced the diaphragm? Do you have a 4160 carb? Any modifications? Dropped her in the water and was still not gettiing her over 3,000 RPM Holley makes a number of different springs with different tension on the springs I dont think the secondaries were opening, could be the diaphragm, too strong of a spring, or just needs a cleaning If they open easily, the problem is vacuum-related $45 VIEW PRODUCT This screw seals up the passageway that aligns with the passageway that intersects with the original distributor vacuum port opening 060 and try it I bought a new one Top Rated Seller Top Rated Seller Blew it out and ran fishing line through all the jets Tech Document - Holley /a > step 1 back them out 1 full turn and restart the engine # And fuel consumption 3810 off our member & # x27 Brand new high quality Aftermarket part by Carbhub Holley trick - put a (lite) paper clip on the shaft coming out of the vacuum secondary housing 5 to 2 turns Next I replaced the Holley Carb with a new one ( 0-80319-1 600 CFM Four Barrel Carburetor Model 4160; Electric Choke; Vacuum Secondary; Calibrated for Small Block 351 Ford Marine Engines) Holley carburetor carb metering block The There are two types of secondaries available on the traditional style Holley: vacuum or mechanical 1 out of 5 stars 354 1 offer from $11 secondary spring pressure Likewise, a stiffer spring will delay the secondary opening “Winging” the throttle with the transmission in neutral should result in no secondary movement Holley offers a wide range of tuning parts that are very easy to tune and optimize with only The front and back of the carburetor air cleaner this can cause a lower boost manifold vacuum port bores! Carburetion 04) in all cases Location I've always used the lighest or the purple Thereof, what is a Holley 4150? Holley 4150 Overview The 4150 carburetor was first introduced for the 1957-58 Ford Thunderbird Read testimonials gives a much more proportionate knowing of the benefits and drawbacks of … HOLLEY FORM NO They are held *shut* with vacuum Please be patient, I'm NO mechanic Vacuum secondaries are designed to open when the engine is under load I bought a new diaphragm but when I pulled the housing off before splitting it open, I checked it with my vacuum pump/gauge and it works ) use vacuum to control when the secondary butterflies open, and they do not have a separate air flapper valve With the purple on a 600 sitting on a mild 302, F4TE roller cam (this is the explorer cam) ported E7 heads and a Ford A321 intake (high rise dual plane) it would open the secondaries about a second or so after nailing the pedal If you feel the secondary opening, chances are the air valve is opening too soon Single feed fuel inlet for easy installation; Integrated 700R4/200R4 transmission kick down cable mounting; Vibratory polished aluminum for good looks and long lasting shine Secondary throttles adjusted to not open fully Results in: Poor WOT performance So once again it's that time to get the boat out of storage and do the whole de-winterization process and check everything over on the motor and get the ol Holley tuned up com /a > Holley 1920 1 barrel manual the secondaries open as expected Nov 1, 2001 Details $49 You got your foot in it, right? For reliability, a plug and an increase in jet size to compensate is a good thing to do, as Big Al suggests A GENUINE HOLLEY REBUILD KIT HAS BEEN USED THROUGHOUT THE CARBY INCLUDING NEEDLE AND SEATS AND ALL GASKETS, INCLUDING THE POWER VALVE AND THE PUMP PLUNGER 050 zz430 (fastburn) heads, right springs for cam 5 Compensate for all vehicle weights,gearing& transmissions to allow smooth opening of secondaries Make sure the secondary valves are closed at idle Tuning the open-rate of the secondaries can make your vehicle more responsive and enjoyable to drive 055" restriction You will, however, gain fuel economy if you setup the secondaries to open above 3500rpm, that way you can plane up, and cruise all day long @ 3200-3400 on the primaries Only 1 left in stock (more on the way) a vacuum operated power enrichment system and a selection of power 4 wheel stock disc brakes 5-inch handheld (only), wait for the temperature to achieve 160 degrees F The vacuum secondaries are controlled by a diaphram and a color coded spring An accurate vacuum gauge, such as Holley P/N 26-501, should be used when determining the correct power valve to use NOTE: These instructions are provided by Holley Performance Products and are posted for review purposes only and are not meant to be used as an installation guide 00 you can move the secondaries be hand and they seem to be free How the vacuum secondary system works on a Holley basically is the spring changes the rmp that the secondaries start tob open Find Holley Carburetors 750 CFM, Vacuum Secondary Type and get Free Shipping on Orders Over $99 at Summit Racing! 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Square Bore, 4-Barrel, Vacuum Secondaries, Dual Feed, Aluminum, Polished, Each Features Holley makes a the secondaries, since the PV is wide open any time the secondaries are open anyhow 510-135-4 Vacuum secondary daiphram Now when the VS starts opening it will "push" the washer and o-ring back down the shaft as far as it actually opened it Also you will not see gas being squirted when you open the secondaries Joined Jun 2, 2010 · 277 Posts #21 · May It has to have a crack or porosity or something preventing the vacuum drop HLY-20-59 QR Code Link to This Post DeepRoots · Registered Bestseller No Which position is appropriate depends on your engine's operational speed 6 For example, the number “65” indicates that the The Holley 750 cfm 4 barrel carb(21847) is not a direct Holley 4160 with electric choke, vacuum secondaries, and Holley's secondary diaphragm spring kit 20-13 to tailor the secondary opening characteristics to any particular engine and vehicle configuration There is a check ball located in the secondary Position 1 brings the pump shot in sooner, while 2 and 3 delay it 1974 351W, Holley 670, Tremec 3550, 95 GT rear w/3 Part Number: HLY-0-82750SA Hg, "85" indicates in Street Warrior comes standard with Electric Choke, Vacuum Secondaries, and a new integrated 700R4/200R4 compatible throttle lever 688 in X Find many great new & used options and get the best deals for BIG-10258 Holley 4150 & 4160 Vacuum Secondary Adjustable Spring Kit & Open Chart at the best online prices at eBay! 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Holley's Model 4160 four barrel carburetors are designed for budget minded enthusiasts and are calibrated for use on stock to mildly modified engines Install the metering blocks on to the new main body 037” squirter size, a 50cc "REO" pump may also be required, available under Holley P/N 20-11 Holley Carburetor i cant seem to find any vacuum leaks or any thing that … On my '71 quench head M-code the vacuum secondaries open around 2500 RPM, If Needed none are your holley vacuum secondaries working? here is how to test them in several different ways Finally put the car on a chassis dyno and actually confirmed one opened by not the other There is no "kick" but you can feel and hear it - Unless your air filter is really clogged, it does not affect secondary opening rate or timing Changing from a restrictive air filter proves your own point of the air cleaner was restricting power I am assuming it is an anti back fire ball check to save the diaphram The engine will determine the opening poiht and RATE that the secondary butterfly valves open and begin feeding fuel I always remove the adjustment screw from the bottom and screw it in from the top Holley does a pretty decent job of supplying a I plan on having a redline at 5500 and the carb is useless if it Hook up a vacuum gauge and roadtest again The check ball Kim mentioned regulates how fast the secondaries open Before moving any further, make sure the cam is set to for models:750 - brand:holley - mpn:10569 - type:vacuum secondary 4150 4160 Which the engine MAY or MAY NOT be ready to deal with Brand: Holley this is the vacuum secondary venturi that air is drawn from by the downflow through the primaries to open the secondaries 050) with the basic race-ported Dart Iron Eagle heads (using the green curve in Figure 6 Holley 20-59 - Holley Vacuum Secondary Carburetor Accessories It will respond, but with a lot more wasted fuel 5 out of 5 stars ( 29 ) Part Number: HLY-20-59 Make squirter changes in 3-step increments- i Re: Holley 4 Barrel, Carb Secondaries Not Opening Good kit comes with every thing I had to open up pri and sec holes a little This is Holley’s vacuum classification for their opening vacuum Mechanical secondary Holley carbs (right) do require a secondary accelerator pump circuit since the … Holley 2140 & 4000 troubleshooting Model 4160 9 product ratings - Holley 125-85 Single-Stage Standard Flow Power Valve 13 product ratings - AED 4160 Holley Rebuild Kit Vacuum Secondary Carb 600 650 750 1850 3310 80508 Cobra Make, Engine: Lonestar Classics LS427 Location: central Illinois The secondaries are staying cracked open a bit ) 11 The fuel line and fittings are brand new as they had the wrong lne on it keeping the secondaries from opening [ my guess as to why it was This Holley 4160 Series 390 CFM 4 barrel carburetor is ideal for small displacement V8 or V6 engines 7 As with a mechanical-secondary carburetor, the AVS type uses a mechanical linkage to drive the secondary throttle blades open The full manifold vacuum source in the front of the throttle body provides vacuum for proper operation of the air cleaner, the pump diverter valve (if equipped), AC/Cruise, and/or the temperature sensing valve Do not clip a spring in an effort to make a spring weaker, so the secondaries will open sooner Holley 4BBL Vacuum Secondary 600CFM Description: SMI - STAGE TWO - 1850 (600 CFM) 4160 HOLLEY SINGLE FEED FOUR BARREL: Our Price: $749 They are made of diecast aluminum and are chrome plated for durability Posts: 459 The spring holds the diaphragm so it will not open the secondaries Same as Stage 1 plus: Quick change spring kit installed to allow secondary opening rate changes (Faster for tacky tracks, slower for better traction on dry or slick tracks) in seconds The vacuum housing is larger in diameter than a soda can and an obvious clue that it isn’t your run-of-the-mill 750CFM Holley Then you dont have to pull the carb to make an adjustment If anything, a free flowing air filter would assist an engine to get lower vacuum readings You can now remove the base plate and accelerator pump squirter Too much spring pressure and your secondaries loaf or do not open at all to the stock Holley spec for your carb List Number (stamped into the front Vacuum secondaries for use on wide variety of vehicles This tunnel ram is set up with a pair of 0 Try adjusting your air/fuel mixture screws post id: 7469188750 As mentioned earlier, by selecting the correct spring for the vacuum chamber, you take care of 90 percent of the tuning of Features: Gold Dichromate finish for corrosion resistance and classic Holley looks Throttle Bore; Shiny Zinc Finish; 1 Timed Spark Vacuum Port; 2 Full/1 PCV Vacuum Port~Straight Leg Booster Holley has been the world leader in carburetors for over 100 years Factory preset electric choke for easy startups To slow the idle, turn the screw counterclockwise Dual feed fuel inlets for constant high volume fuel delivery; Compatible with GM, Chrysler, and Ford A/T kickdown linkage 5 - carb too small or spring too heavy (Had some good aiflow mods too A 65 render that inoperable Holley In a 4150 and Dominator, these carbs have a power valve in both sides, primary and secondary I then went to almost 5500rpm and the clip had moved a little Street Avenger carburetors are known to bolt on right out of the box and have great features such as a quick change vacuum secondary for easy fine tuning; optimized street calibrations; four vacuum ports for all necessary vacuum accessories; factory preset electric choke for easy start ups; built-in fuel filters; and an included … Holley 750 CFM Classic Holley Carburetor 0-80508S Now I also think that the vacuum circuit gets some restriction from this ball Zogman · Registered This surging airflow provides a stronger and stronger vacuum signal to the diaphragm that controls the secondaries As rpm increases, so does the vacuum signal in the carburetor venturies All Holley Marine Carburetors are designed to YEARONE Classic Car Parts for American Muscle Cars | Barracuda Cuda Challenger Charger Chevelle Road Runner Camaro Super Bee Dart Duster Valiant Firebird GTO Cutlass 442 Mustang Nova GM Truck Skylark GS Monte Carlo El Camino Mopar Chevy NEW Holley 4160 Alcohol Resistant (ETOH) Carburetor Kit Vacuum Secondary 600 750 (are you asking vac readings with it sitting still in gear and running on the road as well?) Only changes to carb have been tuning with the stock configuration-Adjusting secondary plates to Holley's recommended Holley 600 CFM ‘Street Warrior’ Carburetor The Road Demon 725 is perfect for stock V8 engines from 350 to 500 cubic inches 95) and read the chart you'll understand 4) came out to 1 Report abuse I've heard about putting a small machine screw through the slot An AVS carburetor relies on both mechanical and vacuum systems for the operation of the secondaries 979 Hooked the carb back up and went for a test drive If they do open in neutral, the engine will almost surely bog under load I would think the carb should start opening around 4000 SO on a punch, vacuum is low, secondaries will be closed I had to pour the carb cleaner in a large pot so all of the larger parts could soak You will never see the vacuum secondary open all the way in the shop just wacking the throttle as there is not enough The ”715”, “735”, “750”, “780”, “800” and “850” (1&5/16” and larger primary venturi) vacuum secondary carbs will not function correctly without the little slash-cut brass tube in the primary which was in all the old carbs in the vacuum passage to the secondary diaphragm, to amplify the secondary opening signal " There is a small check ball in the vacuum port of the lower diaphram housing (Model: 4160) Holley has been the world leader in carburetors for over 100 years Posts The mechanic said the secondaried aren't opening up ) Opening the secondaries is first dependent on the velocity of air flowing through the primaries Read more Note: NFOAMAF = not fully open at maximum air flow IIRC, the open chamber 4V's with CJ cam peaked between 5400 and 5600 RPM, so I'd expect to Holley 4160s can also be changed into 4150s with the purchase of a changeover kit For installation instructions to actually install the Holly Truck Avenger, use the … Fitting a stiffer spring in the vacuum capsule worked well, but then the secondaries did not open all the way Ported vacuum is vacuum that is present only after the throttle blades are open slightly If vacuum for more Shop for 1967-1969 Corvette 3x2 Holley Vacuum Diaphragm Kit from Zip Corvette - your source for 3x2 carburetor components including vacuum secondary diaphragms 51 6 The secondary diaphragm was torn and wouldn't hold vacuum $ 425 It is common for this to be misadjusted so that the secondary throttle blades do not fully open Bilge Pumps; WashDown Pumps; Switches; Carburetor Rebuild Kit 3-200 for Holley Vacuum Secondary 1850 3310 3906 0750 CFM The power piston was completely seized as well #10 5'' Hg Air filter shouldn't have an impact on secondary opening Features: Model 4160; Vacuum secondaries; Electric choke; 30cc accelerator pump Holley 0-80537 Model 4150 750 CFM Four Barrel Marine Carburetor with Mechanical Secondaries I've used a paper clip on the shaft to confirm that the Figured it out: It was the vacuum line that runs between the two vacuum housings on the two carburetors 5 - carb is too big, or secondary spring too light It has a secondary link that makes it completely mechanical added by someone sometime (A long time ago) Kit Contents: Holley 20-59 Cover-Diaphragm Housing 1 x 4 BBL This item: Holley 20-13 Vacuum Secondary Spring Kit Open Hole Carburetor Adapter 4bbl Holley / Quadrajet Afb - Spread / Square Bore 020" exposure of transfer slots and adjusting Air Fule Mixture Notes: Street Avenger Carburetor -- 4 bbl; 770 cfm; Model 4150; Vacuum Secondary; Electric Choke; Gasoline; Dual Fuel Inlet; 1 -main jets are #72 As the primaries open the linkage will let the vacumm open the secondaries as needed based on engine load Above a 0 We are proud to announce the newest member of Compensate for all weights to allow smooth opening of secondaries Local Time: 11:25 PM The opening rate of a mechanical secondary carburetor (often called a double pumper) is predetermined by the linkage designed to allow the secondary throttle plates to begin opening once the primary throttle plates have rotated open about 40 Quick-Checking Holley Vacuum-Secondary Operation Brand I believe it has something to do with the air/idle mixture screws and Observing the temperature on the 3 8 Street Avenger 4BBL Carburetor (0-80670) by Holley® The 600 CFM vacuum secondary Holley is one of the most common and street friendly carbs on the market Blemish Outboard Parts; Blemish Inboard Parts; Blemish PWC Parts; Accessories & Bilge Pump Holley makes a spring Named C-3B for “Chevrolet three-barrel,” it came with the plenum divider milled down in the rear "75" indicates … Start by turning one of the idle mixture screws on the primary metering block clockwise until it bottoms out I'm tuning the secondaries on my Holley 670 A NIB Holley should not need any adjustment assuming it is the correct Holley for the engine Refer to “No high RPM or top end power” Consequently, on a street driven vehicle a split plenum intake with a vacuum secondary carb is the way to go 68 Standard Air filter shouldn't have an impact on secondary opening To quicken the response to demand you can get a Holley spring assortment and change the spring under your secondary diaphram 076 leaned / delayed your idle fuel not richened This is normal while the engine is not under boost This is in contrast to a Holley that uses a vacuum diaphragm to operate the secondary butterflies Adjust each idle mixture screw (Figures 3 & 4) 1/8 turn at a time, alternating between each screw Switch would ground or unground the light depending on how you wire it When it comes to the secondary system of a Holley four-barrel carburetor, the opening of the secondaries can be done by either a vacuum signal, or by way of mechanical operation If fuel is seen dripping, the float is stuck or needle and seat are dirty and stuck and see if that will allow the idle to drop down Picked up kit on 10-06, finished 10-09 The primary metering block is usually located closest to the front of the engine The metering rods are changed to tune the wide-open throttle mixture Shut off the engine, ensure power to the Sniper is switched off NEW HOLLEY CLASSIC CARBURETOR,POLISH ALUMINUM,750 CFM,4160,4 BARREL,ELECTRIC CHOKE,GASOLINE ONLY,VACUUM SECONDARIES Product Description & Features: Brand New Holley Aluminum Classic Carburetor with Electric Choke The way it works is by drawing fuel and air into the engine by way of a vacuum that is created while the engine is running From what I understand, it's supposed to equalize the vacuum between the two carbs so when the secondaries open, they open at the same time Ditto on a 390 with a 750 Holley Pit Stop USA offers AED Holley 600-950 CFM Holley Vacuum Secondary Carburetor Rebuild Kit 4160 at low everyday prices Overview Holley carbs have been used by hot rodders for many decades now This will give you a good starting point Talk to the experts When you buy the spring kit ($9 Product Name: Holley 4BBL Vacuum Secondary 750CFM Jump to Latest Follow 21 - 30 of 30 Posts Boat idles at 800 rpm do NOT contact me with unsolicited services or offers Being a 4160, it doesn't allow for changing jets on the secondary side so I purchased a conversion kit and pulled the carb off Since I had to adjust the floats and secondary spring I was just wondering if there were any other tips out there it acts like the vacuum diaghram that pulls the secondaries in is not working properly 2 Used block is off a core carb and will need cleaning before use Putting this data into the equation, you get: CFM = 482 x 7,000 x 1 Fuel mileage is good 30cc Accelerator pump for smooth starts Vacuum for air cleaner, canister, power brakes, distributor, PCV, EGR So I replaced the little gasket between the housing -green accelerator pump cam Jump to Latest Follow 1 - 18 of 18 Posts 00 – 1 The I gained a little by fine tuning idle mixture and one jet size on the secondaries, but I was pretty close! (With the timing optimized and the carb tuned on the wideband, it passed the IM240 smog test with flying colors! Not bad for a dart-headed 306 with a Comp Cams 270h cam, offroad exhaust and Holley double pumper!) The DP gets away with the mechanical secondaries opening RIGHT NOW by adding a second pump shot to cover the big air hole it created 0122, 7am-10pm, everyday It doesn't bog or hesitate, it just pulls harder This 750 carb was not installed on Chrysler production V8s Apart from improving street drivability, it is often possible to use a vacuum secondary carb of about 50 cfm more than with a mechanical secondary It also shows how to modify the carb with a metering block and jets for the secondaries and talks about other hop up tricks It is vacuum vs Holley offers a kit (PN 20-13) that contains several color-coded springs The amount of air then controls how quickly the secondary air valve is blown open If the primarys are closed the secondaries will not open no matter what the vacuum is I like vacuum secondary types because they drive better on the street and give better mileage in general, and works fine in my experience I drive it maybe once a week around town, but bring it to the track on the weekends to run the points series At the end of last year the carb started acting up on me once again C-228-1 (SUPPLEMENT ro C-2281 CARBURETOR MODEL 4000 FOR LINCOLN, MERCURY Will Open the secondary throttle plates, while at idle and lower speeds, the plates are closed Estimated Ship Date: Today In vacuum actuated carbs, the secondaries open up only when the vacuum across the primary venturis reaches a certain level Complete modified 600 carb, it is now a 450 CFM 3bbl 5-18 Dave ut yi fy qq gv tu il ia lg kw