Holley Vacuum Secondary Spring Chart

Holley 4 Barrel Carb Information List # and Stock Jetting If this is your first visit, be sure to register. Holley itself has a huge website at Holley. This low pressure pulls back the diaphragm that actuates the secondary throttle lever. I installed the secondary spring kit too. The reason I set up this guide, and my Holley guide as well, is because I was never able to find what I was looking for when rebuilding. The Holley we selected was a 3310-1, which is a 750 vacuum secondary with the secondary metering block (not the cheap plate). To determine the flow, you could remove it and measure the bore sizes. In an effort to help our viewers identify which Holley carb they have or what carburetor they want to buy, we've put this list together. Read the tech article on a Holley Vacuum-Secondary Operation, brought to you by the experts at Chevy High Performance Magazine. Floods terribly at idle. Try these tuning/adjustment tips. Add to cart. 23 gear in a 3800 lb. Hey all, Ive got a VK which ive just converted to 308 with a celica box. it now works perfect at low and high end. Holley Model 4160 Street Performance 600 CFM Square Bore Vacuum Secondary Manual Choke New Carburetor Holley has been the undisputed leader in fuel systems for over 100 years. There are several springs available from Holley and others that allow the camber opening rate/point to be tailored to the vehicle's needs. It does not open the secondary at all. I was wondering, what determined which carburetor ended up on which car?. Jets for the Holley carb are readily available from Holley at most speed shops. Did the mod. Compensate for all vehicle weights, gearing & transmissions to allow smooth opening of secondaries. 4) Reset to factory specs. The shop manual also references the first gen Holley 4150 as an option. If the idle vacuum is less than 12 inches Hg. In such instances, a bigger carb. Spring pressure is what changes the actual operating range of the power valve. Whether you're performing an original restoration and need factory-matching external parts or performing a highperformance build, you need to select a compatible intake manifold. Holley ships all vacuum secondary carburetors with the stiffest, black spring. Look for a vacuum tube coming from near the base of the carburetor. Does it have 4 corner idle adjustment? I'd bet it is a 750 cause everyone knows you have to have a holley 750 to go fast. 6 rockers, World Products heads, 9:1 CR, small diameter long tube headers, in an ERA Cobra 289/FIA. Also note chrome ball will be here on 71+ Holley. 095" The rod moves up and down in the jet to change the orifice size depending on engine vacuum. Even though one may look just like another, the link length can vary. It is best to select a new spring on the basis of vacuum readings, but in the absence of a gauge, try the strongest spring (highest vacuum rating) to see if the problem goes away. Edelbrock Performance Carburetors and accessories are made in the USA and are available with a 500-800 CFM rating for AMC, Buick, Chevy, Chrysler, Ford, Oldsmobile, & Pontiac engines. it now works perfect at low and high end. The Holley we selected was a 3310-1, which is a 750 vacuum secondary with the secondary metering block (not the cheap plate). Getting them open a little earlier may be enough if your only slightly lean. Find great deals on eBay for holley vacuum springs. Conceptually, the 4CG is two 2CGs welded. Be sure to check out all of our products from Holley Performance Products including Holley Performance Products Accelerator Pumps. Quick change secondary spring kit GM Throttle cable/return spring bracket kit Chrome fuel line Manual choke control cable Ford Automatic transmission. Likewise, a stiffer spring will delay the secondary opening. The pink cam and the Mopar carb have 3 holes so I guess the typical Mopar attention to detail gave us spring and fall as well as summer and winter. 750 CFM, Dual feed, w/ vacuum secondary. As an example, a vacuum reading at idle of 13 inches, is divided by two and results in a 6. I don't recall whether you need a stiffer or weaker secondary spring to keep the secondaries closed more, but the spring kit should have a sheet in it. Big-10258 Holley 4150 4160 Vacuum Secondary Adjustable Spring Kit Open Chart. If your running an auto with low gears 3. Information On Car and Truck Repair, Parts and Services. How to Select the Right Holley Carburetor for Your Car a carburetor equipped with vacuum secondary operation is almost always better than a double-pumper carb. Splitting the timing control into a secondary process will add very little time to the total install, but could significantly help with trouble shooting, should it be needed. I believe the best solution is what Rusty said above, and the only way to get it right is tune it under load, either at the track or on a dyno. HOLLEY 4180. 0, topped with a Ford A321 intake and Holley 570 SA carb. 7026203 - number is on the blue 'bottle cap' visible on the throttle side. The secondaries on the 600 Holley never opened more than a 1/4 of the way with the stock secondary vacuum spring at full throttle on the road. The video describes the various rate secondary springs, how to change them, and the testing procedures to follow to make sure the secondaries open properly for best performance. The Vac Secondary Spring or the Power Valve or both may require some adjustment but with plenty of different Power Valves available and a Vac Secondary Kit with 5 or so different springs available Holley's are very adjustable. PP springs aren't always mentioned when Q-jet tuning is being discussed, but need to be addressed just like if it were a Holley PV. Holley 4150 4160 Vacuum Secondary Adjustment 7pc Spring Kit Chart Oem Carbs. The often-perceived reduction in performance because of secondaries that do not open right away is mostly a myth. 5 inches of vacuum. Skip to content CSI Automotive Sales, Service & Parts. Remove secondary vacuum diaphragm housing. Please refer to the chart provided (Figure 1. Holley 2-Barrel Six-Pack Carburetors - Mopar. You can change the springs and change the opening moment. Check the size of. Find helpful customer reviews and review ratings for Holley 20-13 Vacuum Secondary Spring Kit at Amazon. As you pull the choke knob, the jet rotates, so enriching the mixture. The OE Mopar carbs originally had a wire stem with the end bent 90 deg. a parts diagram of Carter/Edelbrock 4 -barrel carbs. Springs should not be clipped in an effort to open the secondaries sooner. The stock Holley opens at about 50% throttle and the BG one opens at 25% throttle. In 1969, Chevrolet switched to a mechanical-secondary carburetor. Holley Combo : Street Avenger 570 or 670cfm (PN:0-80570 or 0805670) Street Avengers are a new lineup of carbs by Holley. This part covers the power valve, vacuum secondary, the accelerator pump and flooding problems. Accelerator pump. The 4160 and 4150 carburetors have the same five-inch by 5½-inch bolt pattern (the same bolt pattern as the early Carter and Ford four-barrels). and its larger secondary barrels are vacuum actuated and supply fuel as demand requires. 73 or higher, go with a double pumper. One at a time, slowly turn the screws in until the vacuum starts to drop off, and then back the screw out a quarter turn and it should be good. Holley 4150 4160 Vacuum Secondary Adjustment 7pc Spring Kit Chart Oem Carbs. Carburetor and Fuel System Troubleshooting Guide. Holley offers an inexpensive kit with seven springs that offer a broad range of opening points. The silver spring may be OK but try the yellow one anyway after you get the carb dialed in. Exact for all 1968 - 1969 small block Z28 302 and 1968 big block 396 / 375 high performance models. I soaked and rebuilt this using a factory Holley Trick kit and was going to use it on my new engine but I'm going in a different route. Ford Inline Six, 200, 250, 4. The vacuum secondaries are controlled by a diaphram and a color coded spring. vacuum secondary springs and just about anything else you'll need to know about a holley carb. secondary carbs never had a rear idle circuit. 0, topped with a Ford A321 intake and Holley 570 SA carb. so on holley's carb chart we're. MODEL 4500 ULTRA HP DOMINATOR SERIES. The kit to convert your Holley to a quick change secondary spring system is really cheap as is the spring assortment. The pink cam and the Mopar carb have 3 holes so I guess the typical Mopar attention to detail gave us spring and fall as well as summer and winter. It's running the stock secondary spring, which is pretty heavy, IIRC. 23 gear in a 3800 lb. I had been using a Holly 600 CFM vacuum secondary but was having a lot of trouble with it. Aed Holley Carburetor Vacuum Secondary Spring Kit 600 750 Carb 4160 Model. My thought is the larger diaphragm applies more force, which may make that spring chart useless. Three are still available but there used to be others. Mainly because the vacuum secondary and electric choke which increases starting and drivability. I would think it depends on the thottle position relative to the t-slot and idle port; and also the manifold vacuum at the time of opening. Spring pressure is what changes the actual operating range of the power valve. Either way the id numbers are stamped into the choke tower. Read the tech article on a Holley Vacuum-Secondary Operation, brought to you by the experts at Chevy High Performance Magazine. The opening rate of a vacuum secondary system is controlled by the diaphragm spring located in the vacuum secondary diaphragm housing. Engine vacuum is what actually operates a Holley power valve. If your running an auto with low gears 3. Holley 4180-C 4V Remove the choke thermostatic spring. Also note chrome ball will be here on 71+ Holley. Failure to follow these instructions, including the pictures may result in subsequent system failure. The aluminum construction results in a product that is 40 percent lighter than Holley's other carburetors that are constructed from zinc. An 850 cfm "double pumper" turns out to be a 650 cfm with vacuum secondaries. However the carb is leaking everywhere and the secondarys have never worked properly. ADJUSTMENTS. I don't recall whether you need a stiffer or weaker secondary spring to keep the secondaries closed more, but the spring kit should have a sheet in it. WOT tests to the speed limit. Holley itself has a huge website at Holley. Holley Vacuum Secondary. In reality, setting the basic idle on a Holley isn't difficult. SECONDARY DIAPHRAGM SPRING KIT P/N 20-13 For models 4150 & 4160 Vacuum Activated Secondary Carburetors INSTALLATION & TUNING INSTRUCTIONS 199R8219-3 INTRODUCTION: This kit contains a variety of secondary diaphragm springs to tailor the secondary opening characteristics to a particular engine and vehicle configuration. Some Holley carbs have diaphragm-style pulloffs; the common “performance” or “aftermarket” Holley carbs (and some older Rochester carbs) have a metal pulloff piston inside the choke housing. What that means is the “rods are down” until you approach only 4” of vacuum, then they go up and richen the mixture. The vacuum signal for the advance needs to come from a ported vacuum source on the carburetor, and not from manifold vacuum. Please be sure to match your list number, which is found on the front of the tower. As an example, a vacuum reading at idle of 13 inches, is divided by two and results in a 6. Just like the Q-jet and Weber 750's, the secondarys will never fully open on a 350/1 cubic inch engine, that will only see around 5K rpms. Check the chart below for correct spring color (plain color are used from speed shop carbs). It would have originally had a metering plate in the back with fixed jetting, instead of a metering block that accepts screw in jets, and the vac. Spring pressure is what changes the actual operating range of the power valve. For the sake of this story, we'll assume you're new to the Holley carb game. 160" drill bit for 49 states and Canada, or 0. I will be the first to admit and try to sell that. Production used two springs: one light and one heavy (with a loop in the end). The pink cam and the Mopar carb have 3 holes so I guess the typical Mopar attention to detail gave us spring and fall as well as summer and winter. Engine starts, then races for a few seconds and then dies. Any vacuum secondary carb will allow the secondary barrels to open as much as the primaries are. We’ll show you how to do it on both vacuum secondary and double pumper models. How to Improve Pontiac V-8 Performance: Tuning Guide. I just read your other post. There are two common styles of Holley choke housings: those that use “external” vacuum and those that use “internal” vacuum. Most vacuum secondary carburetors determine the rate of opening with different spring tensions - to change the rate you have to disassemble the housing and change the spring. Note spring orientation, it snaps into the post. in a hook that fit a hole in the lever on the shaft, similar to some vacuum secondary spread bores. I verified operation of my vacuum diaphragm with a hair pin on the actuating rod with these springs and got different results from a genuine Holley kit I ordered from Summit Racing. The Secondary Throttles (1) begin to open when the Primaries are about 65% open. The 4100’s vacuum secondaries are activated by a vacuum servo at the back of the carburetor body connected to the secondary throttle plates via a plastic linkage. One at a time, slowly turn the screws in until the vacuum starts to drop off, and then back the screw out a quarter turn and it should be good. Factory Refurbished carbs have undergone a thorough inspection. Its hard to over carb with a vacuum secondary carb. A better choice would have been vacuum secondary carbs in either Holley or Edelbrock. With vacuum secondaries, you can change the secondary spring to keep the secondaries closed for better gas mileage, yet still have them open during passing and hill climbing. 4) Float level setting very low. There are a number of ways to tune the moment when the vacuum secondaries open on a Holley four barrel carb. by Keith Indy. Holley part numbers are located on the carburetor air horn. secondary carbs never had a rear idle circuit. NOTE: Some Holley 5200/G180 carbs have only a primary idle system, while others have both primary and secondary idle system. Jets for the Holley carb are readily available from Holley at most speed shops. Felt that my 351W wasn't running as well as she might, so checked out the timing and carb settings. The spring in the secondary diaphragm pot is a return spring along with a gauging device. Did the mod. I would go with 670 holley street avenger for the 383 for just driving around or 750 holley if you want max hp. Additional parts may be required. It replaces the cover on the right side (facing up) and makes changing secondary springs so much easier. Most vacuum secondary carburetors determine the rate of opening with different spring tensions - to change the rate you have to disassemble the housing and change the spring. Vacuum Secondary Holley Spring Kit: Select install repair and modify Holleys full line of performance fuel system components Charts clearly guide you through the. Quick change secondary spring kit GM Throttle cable/return spring bracket kit Chrome fuel line Manual choke control cable Ford Automatic transmission. spring change to a lighter spring) This is what I have on my V8 Ranger, a mildly built (Explorer 5. This low pressure pulls back the diaphragm that actuates the secondary throttle lever. Manufacturers install ports on their manifolds for lots of different reasons: Brake Booster, PCV tube, EGR Switch, A/C vents. Purchase Holley Vacuum Secondary and save!. It can be made to open sooner (with a lighter spring), or later (with a heavier spring) depending on how much air it requires to overcome the spring tension on your particular engine. HIGH PERFORMANCE TUNING INSTRUCTIONS FOR HOLLEY PERFORMANCE CARBURETORS 199R7849-2 NOTE: These instructions must be read and fully understood before beginning installation. 3) Locate leak and correct. Holley 20-12 Accelerator Pump Camshaft Assortment Kit in Cam Holley 20-13 Vacuum Secondary Spring Kit These should come with a chart to know which colors do. The vacuum secondaries are controlled by a diaphram and a color coded spring. 160" drill bit for 49 states and Canada, or 0. Big 10258 Holley 4150 4160 Vacuum Secondary Adjustable Spring Kit Open Chart. Another way to control the secondary opening point on a four-barrel carb is with a vacuum diaphragm that uses primary airflow velocity to create a vacuum signal in a diaphragm module. 5:1 ratio at part-throttle cruise. When you close the primary, it will force the secondary shut. The video describes the various rate secondary springs, how to change them, and the testing procedures to follow to make sure the secondaries open properly for best performance. Holley Vacuum Secondary Spring Kit Assorted tensions to change secondary"s operating range Holley 20-13 Part Number: 510-20-13. 4) Float level setting very low. You may find other numbers stamped on the carburetor, but they are usually the part numbers of the part they are stamped on. How to Select the Perfect Holley Carburetor for Your Car. I had to play around with the secondary on my jetboat's Holley 750. Match with a variety of manifolds that include Edelbrock Performer, Performer EPS, Performer RPM, RPM Air-Gap, Torker II and other brands of similar design. There's probably less manifold vacuum when the secondary opens so a larger IFR might make up for that. Holley ships all vacuum secondary carburetors with the stiffest, black spring. Holley makes a spring assortment kit(P/N 20-13) for tuning purposes. The purpose of changing the spring is to allow the power valve to remain closed at high vacuum cruise and open at W. • Provides springs of various rates to allow the racer to custom tailor the vacuum secondary opening and closing rate to best suit their combination • Contains seven springs; color coded from. The pink cam and the Mopar carb have 3 holes so I guess the typical Mopar attention to detail gave us spring and fall as well as summer and winter. Unlike Holley carburetors it is common for EPS carbs to have larger primary jets than in the secondary due to the metering rod restriction. Engine vacuum is what actually operates a Holley power valve. If you have a 4spd and 3. 3310-3 is the third version of the common 750/780 vacuum secondary carb. So if you go with a Holley make sure you fool around with the springs. Vacuum Secondary Adjustable Spring Kit & Open Chart. ADJUSTING THE OPENING POINT OF VACUUM SECONDARIES There are a number of ways to tune the moment when the vacuum secondaries open on a Holley four barrel carb. If you want to know more on the mod. The often-perceived reduction in performance because of secondaries that do not open right away is mostly a myth. Re: how to get a holley vac secondary open quicker. Running real rich now with 66. 5 inches of vacuum. The power valve provides extra fuel when the throttle is open for heavy acceleration. 1) Big vacuum leak somewhere. should use a vacuum secondary carburetor. This draw will pull on the internal diaphragm of the vacuum secondary housing, causing it to open the secondary throttle shaft. HOLLEY CARBURETOR VACUUM SECONDARY DIAPHRAGM quantity. Real nice condition. Vacuum secondaries are appropriate for street performance Holleys. By yknot - 5 Years Ago: What is the best jet size for a stock 292 with a 600 cfm Holey. I?m going to cover some tuning tips that I have applied with great success and also a review of my trail experiences on how well the carburetor operates. I tried 2 corner and 4 corner idle. Discover Holley Vacuum Secondary on sale right here with the largest option of Holley Vacuum Secondary anywhere online. 46 in stock. You can change a spring in no time with the quick change top. PHOTO 6 A choke pull-off needs to be checked with a vacuum pump for integrity and the ability to actually move the choke plate with the engine cold and not running. The vacuum signal for the advance needs to come from a ported vacuum source on the carburetor, and not from manifold vacuum. HOL-20-59 Holley Vacuum Secondary Spring Quick 4160 Vacuum Secondary Adjustable Spring Kit & Open Chart. Holley itself has a huge website at Holley. Another way to control the secondary opening point on a four-barrel carb is with a vacuum diaphragm that uses primary airflow velocity to create a vacuum signal in a diaphragm module. The fuel system of the MGB is adequately covered in the factory workshop manual, and the choice of carburetter needle and spring seems to be just about right. As you pull the choke knob, the jet rotates, so enriching the mixture. Not sure about the Eldebrock works but a 600-650 would be fine. Who knows why they may have done such? It is a vacuum secondary Holley 4150. Its got a fully recod bottom end running a mild (unsure exactly what specs) cam. The opening rate of a vacuum secondary system is controlled by the diaphragm spring located in the vacuum secondary diaphragm housing. cord318 · Yellow(short spring)1620 5680 Yellow 1635 5750. Discover Holley 4150 on sale right here with the largest option of Holley 4150 anywhere online. I replaced the springs and weights, and replaceed the module, cap, coil of the hei with msd stuff in the summer. Failure to follow these instructions, including the pictures may result in subsequent system failure. Engine Vacuum Test. These are the springs included in Holley’s secondary diaphragm spring kit (part number 20-13). The center-inlet 4150 has been utilized on the higher performance versions of the Corvette. 5 power valve. I know holley advertises it as a gas mileage gig, which I think is kinda stupid. On this Holley carburetor, the airflow blown through the front of. All of these parts are available on our website as well as more Holley carburetor tuning parts. A lighter spring will allow the secondary throttle plates to open more quickly. Holley makes about 4 different diaphragms. When I used a vacuum secondary for a little while, my hot little 408w needed a heavy spring to keep from bogging when it was opening. Throttle Lever Bushing & Grommet kit- Rochester, Carter, Holley ; Quadrajet Vacuum Break Linkage Auxiliary Vacuum Brake Rod, 1975-79 Buick,Olds,Pontiac (#3059) Auxiliary Vacuum Brake Rod, fits 1980 & up GM (#3057) Choke / Vacuum Break Rod, fits 1973-1974 Chevy w/QJ #3084 Secondary Vacuum Brake Rod, fits 1979 & up GM (#3056). Holley Vacuum Secondary Spring Engines, Exhaust and Fuel Systems It was a 600 Holley also. To determine the flow, you could remove it and measure the bore sizes. 563in Holley Replacement Carburetors are Engineering to Improve Performance and Keep You Emission Legal. I am trying to increase the fuel economy since this is a street car and will probably never see the track even though it has all the right stuff for drag racing (slow drag racing that is). 80457s 0-80457s Holley Street Warrior 4 Barrell Carburetor For Parts Or Repair. Jets for the Holley carb are readily available from Holley at most speed shops. 5:1 ratio at part-throttle cruise. Holley Combo : Street Avenger 570 or 670cfm (PN:0-80570 or 0805670) Street Avengers are a new lineup of carbs by Holley. Holley 4150 4160 Vacuum Secondary Adjustment 7pc Spring Kit Chart Oem Carbs. They boast quick change vacuum secondary springs, and a more precise fuel metering system. Shop with confidence. You can start heavy, with black or brown, and keep moving up until you get a bog when you go WOT, then go back one spring. Engine starts, then races for a few seconds and then dies. 462cid, 428 HO cast iron heads, headers, healthy cam. The secondaries on the 600 Holley never opened more than a 1/4 of the way with the stock secondary vacuum spring at full throttle on the road. A while back I bought a correct '57 4100 to overhaul and use in place of the AFB, believing it to be a superior carburetor. When using the standard aluminum Edelbrock 3-2 bbl. The engine makes very low vacuum at idle. I verified operation of my vacuum diaphragm with a hair pin on the actuating rod with these springs and got different results from a genuine Holley kit I ordered from Summit Racing. Hg or below. Holley's 600 cfm (model 0-80457C) is a vacuum secondary carb. Pit Stop USA offers Holley Secondary Accelerator Pump Diaphragm Spring Kits 20-13 at low everyday prices. 060, with Elgin 214/224 cam. He traded a 4150-60 series holley straight across to a guy who had a low hour summit 600 (just from his grandpa's recommendation who loved the old ford autolite carbs those summits are based on). As for milage, I am using a 600cfm Holley 1850-square bore, vacuum secondary, and getting approx 25mpg on the freeway. The least expensive online catalog for all your Holley Vacuum Secondary needs. 73 or higher, go with a double pumper. If you have an automatic transmission you will need a vacuum sec. Power Valve Selection. Exploded View Part Numbers Q & A Setup Specs Vacuum Secondary Spring Chart. If the Holley 4160 is a vacuum secondary (I believe it is) it should be fine if it is adjusted right. 5 sounds a bit low for what you've got- then again, a boat might react differently to a car. For example, a power valve with the number #65 stamped on it, will open at 6. The power valve provides extra fuel when the throttle is open for heavy acceleration. Mainly because the vacuum secondary and electric choke which increases starting and drivability. With HIF carburetters, there is a secondary jet operated by the choke mechanism. CARBURETOR HOLLEY MODEL 4150C (Optional) A spring is kc. If the needle of the vacuum gauge slowly sinks towards zero, there is a blockage of the exhaust system. The Holley we selected was a 3310-1, which is a 750 vacuum secondary with the secondary metering block (not the cheap plate). The least expensive online catalog for all your Holley Vacuum Secondary needs. One at a time, slowly turn the screws in until the vacuum starts to drop off, and then back the screw out a quarter turn and it should be good. Step 6: Jet the primaries. Running real rich now with 66. How to tell what size carb you need: You take the engine cubic inch and multiply by the maximum RPM and divide by 3456. In reality, setting the basic idle on a Holley isn't difficult. I don't recall whether you need a stiffer or weaker secondary spring to keep the secondaries closed more, but the spring kit should have a sheet in it. This test is performed to ensure that all idle circuits and other carburetor functions are working properly. A diaphragm is exposed to intake manifold vacuum, and with enough vacuum it overcomes a spring force to close the valve. The often-perceived reduction in performance because of secondaries that do not open right away is mostly a myth. couple of years ago i had original prop re pitched to 13-12 due to WOT issues. I have obtained a handfull of articles & spec sheets regarding tuning of the 4160 series carbs - and attempted to follow suit with tuning for decent power & fuel ecomony (basically a balanced setup, as I interpret it). Do it yourself. Known for its simplicity, durability and performance, the Edelbrock 1406 requires no electronic equipment and no understanding of vacuum lines. I should have posted the carb model. There are several springs available from Holley and others that allow the camber opening rate/point to be tailored to the vehicle's needs. 5 power valve-green accelerator pump cam-. In reality, setting the basic idle on a Holley isn't difficult. See application chart below in tech resources for specific details. I am considering trying out a Holley list # 3916 three barrel carb. When using the standard aluminum Edelbrock 3-2 bbl. 80457s 0-80457s Holley Street Warrior 4 Barrell Carburetor For Parts Or Repair. Motorservice Group uses cookies saved to your device in order to optimize and continuously improve its websites, as well as for statistical purposes. Note spring orientation, it snaps into the post. Now, Holley EFI products power these cars and are dominating the performance world. 031 and a black spring for the vacuum secondaries. couple of years ago i had original prop re pitched to 13-12 due to WOT issues. 126 results for holley vacuum secondary kit Save holley vacuum secondary kit to get e-mail alerts and updates on your eBay Feed. We offer a plethora of Holley Vacuum Secondary for your vehicle needs. 1) Find the vacuum leak & fix it. The carbs here are 4150 mechanical secondary Carb numbers. That ran pretty darn good. The WOT air/fuel ratio was only slightly rich at 12. 2 results for holley vacuum secondary springs Save holley vacuum secondary springs to get e-mail alerts and updates on your eBay Feed. The available Step-Up Springs are listed in the following chart along with their respective “staging” point. All these tests were done on a Clifford water heated intake. Remember the vacuum also runs the headlights and wiper door. With the vacuum-secondaries, diaphragm springs are used to control opening speeds. There are several springs available from Holley and others that allow the camber opening rate/point to be tailored to the vehicle's needs. Find helpful customer reviews and review ratings for Holley 20-13 Vacuum Secondary Spring Kit at Amazon. Listed are all of the currently available Holley ® HP ® carburetor factory specs. If this manual is not fully understood, tuning should not be attempted. 563in Holley Replacement Carburetors are Engineering to Improve Performance and Keep You Emission Legal. HOLLEY 4180. The color coded springs run from light tension to heavy:. Holley's catalog includes all the automotive and marine products offered. All of these pieces are used to tune the basic Holley carburetor. Electric Choke Kits; Floats; Metering Jets; Metering Rods; Metering Rod Hangers; Needle/Seat; Power Piston Spring; Quadrajet Rebuild Kits; Throttle Shaft Bushing; Carb Rebuild & Restoration; Holley. 5-2 complete turns. Find great deals on eBay for holley secondary kit. I've always used the lighest or the purple. Additional parts may be required. vacuum secondary springs and just about anything else you'll need to know about a holley carb. The spring on the metering rod controls what. With the vacuum-secondaries, diaphragm springs are used to control opening speeds. This went on a Ford 302, ~320 HP, 224* I/E,. Who knows why they may have done such? It is a vacuum secondary Holley 4150. The stock Holley opens at about 50% throttle and the BG one opens at 25% throttle. 107; Metering Rods -. Its got a fully recod bottom end running a mild (unsure exactly what specs) cam. now that you've changed the accelerator pump squirter, i'd be trying the 8. with the secondary springs, keep changing for lighter springs until you feel a bog and then use one step heavier. Holley 4-Barrel Carburetors - Camaro, Chevelle, Chevrolet, Corvette, Chevy II / Nova 1964-67 Holley Components - 4160 Series (Single Fuel Inlet 585 CFM 275 to 390 HP) 1965-72 Holley Components - 4150 Series (Dual Fuel Inlet 780-855 CFM 375 to 450 HP). I'm sure you already know but Quick Fuel Technologies makes an adjustable vacuum secondary housing.