. Black is the stiffest, followed in order by brown, plain, purple, yellow, orange and white, which is the lightest. 3310 - 750 cfm is the vacuum secondary carb that has been around for years. Holley Zinc-Coated Double Pumper Carburetor Kit 700 cfm. Years ago Mr. Gasket and others sold a kit to convert 3310 Holley to a double pumper. Part Number: HLY-0-4779CE. Mar 9, 2007. Holley made another 4150 rated at 780cfm besides the 0-3310 and it's sub-versions. For more recent . Holley Ultra Double Pumper Marine Carburetors 0-76750HBM. So the stiff vacuum secondary spring ensures there'll be no hesitation that can occur if the secondary opens too quickly. It is not broken. Building on the proven performance and durability of the Aluminum Street Avenger Series- we have engineered the new marine models to continue that performance heritage that Holley is known for. Note the baseline airflow went from 849 to 872 cfm and it took much longer to unpack the Stub Stack than . Double Pumper Carburetor 6R 2762 B Vacuum Secondary P-36 #e Opens in a new window or tab. Sounds great with the air cleaner flipped! Has one accelerator pump but dual inlet bowls. A tip about vacuum secondary diaphragms. 4150 Stock Appearing Do It Yourself Kit (Must send your M-blocks**) $343.85. You need a new secondary throttle shaft, right side linkages and cams and a vacuum chamber at a minimum. 586-67165 is a race-ready double pumper conversion that includes a primary block with original vacuum provisions and a secondary block with no power valve provision. Comes with all of the screws you need to give your carburetor a fresh look including new fuel inlet nuts. Vacuum Secondary Tuning . That said, you can dial in a vacuum-secondary carburetor to activate the secondaries as quickly as mechanical secondaries. Holley 0-4779C Model 4150 Double Pumper 750 CFM Square Bore 4-Barrel Mechanical Secondary Manual Choke New Carburetor description . Our comparison photo between the two styles illustrates the difference in external appearance. It consisted of a Mickey Mouse accelerator pump squirter with long nozzels that extended over to the secondary side venturies. They are same and work the same and if you don't get the secondaries open, will get the same mpg. Aug 8, 2014. Holley 0-82570 Marine Avenger 570 CFM Four Barrel Marine Carburetor with Vaccum Secondaries. This happened to me once on an 850 double pumper. Add To Cart. Mar 22, 2010 #1. Bruce Reply Or, in actuality, lack of vacuum. i will never own another vacuum secondary carb. I convert 750 vacuum base plates to 750 double pumpers ALL THE TIMEand can take a double pumper base and use it for a vacuum carb as long as the throttle bore is the same. In fact, it is not at all complex, but it can be time consuming. $393.85. View Details. Mechanical secondarys open when you want them to. Now days, only has one metering block along with secondary metering plate (plates is fixed metering, no replaceable jets). timed and full vacuum tubes for accessories and tuning, slip link mechanical secondary linkage, and power valve blow out protection! Holley makes about 4 different diaphragms. It had a squirter that stacked on top of the front squirter and the tubes reached back into the secondary throats. Includes 2 billet purple, billet black, or stock-appearing metering blocks--send us your stock blocks to convert**--4 jets, 1 high-flow PV, 1 PV plug, 2 accel nozzles, 2 high-flow needles & seats . Holley vacuum secondary spring kit: 20-13: Summit Racing: Holley TPS conversion kit, 4160. Theoretically vacs are better. Learn More. Reviewed . See Figure 1. But they used two quarter moon gears on the right side throttle shafts. Includes vacuum for PCV, EGR, power brakes, distributor, air cleaner, and canister. Re: vacuum vs mechanical secondaries First, there are no differences in the primary sides of a 750 vac secondary and a 750 double pumper Holley. Local time . 5.0 out of 5 stars. This is Square bore 4160 style carb with dual fuel inlets, dual pumps, vacuum secondary carb with an electric choke. Holley Performance Products Pro Series Secondary Linkage 20-122 Quick Fuel . Proform Billet Metering Block For Holley 4150 Series Carburetors, Double Pumper Upgrade. The secondary system of a Holley four-barrel carburetor can be either vacuum or mechanically operated. Holley Ultra Double Pumper Marine Carburetors 0-76750HBM. items listed in currency other than U.S. dollars and are approximate conversions to U.S. dollars based upon Bloomberg's conversion rates. 4479 - 750 cfm double pumper is Holley's first attempts at getting a better carb for the hot rodders. Holley 4150 conversion, for 0-1850S / 80457S: 34-65: Summit Racing: Holley 4150 conversion, for 0-3310 and most 4160's: 34-13: Summit Racing: Holley 4150 conversion, for 0-3310S / 80508S: 34-13S . On vacuum secondary four barrels, it will be necessary to remove the "C" clip which holds the vacuum diaphragm stem onto the secondary throttle shaft. No, the car has been running great, I'm just dialing it in. With the secondary throttle stop set, the idle mixture screws should be more responsive. These blocks have a four corner idle system provision (you must have the . Among the most popular 750 cfm Double Pumper Holleys is the traditional PN 0-4779C. Get a vacuum gauge, mount it (temp.) Picked up kit on 10-06, finished 10-09. Do the same thing with the other mixture screw. Holley 4150 Double Pumper Carburetors. The all-aluminum carburetors are hard coat . Secondary block has no power valve provision to fit the latest generation of carburetors. RM428. $393.85. On the 390-based 445-ci stroker motors, I've seen an increase of 20 hp on the dyno by going from a basic vacuum-secondary 750 carb to a downleg-booster double pumper with the same airflow rating. It allows the secondaries to open smoothly to prevent stumbling. FIGURE 1 FIGURE 2 . Worked for a double pumper. Works well. 2500 stall, 3:90 rear end gears. . ; Holley Aluminum Street HP Carburetor available in both vacuum . Observe vacuum at idle, cruise, and wide open throttle. Place carburetor on its side to remove the throttle body screws. . PART# 67165C. Choke vacuum cover after rebuild or when converting to manual choke. Holley 4150 Double Pumper Carburetor ideal for hot street cars and race applications and available in CFM ratings up to 850.; Holley 4150 Classic Carburetor great for stock to mildly modified vehicles, these carburetors stray from many other 4150 styles by offering a vacuum secondary setup. 2. I've also seen a comparable gain going from that 750 double pumper to a larger 850. pump on both primary and secondary with .031" nozzle on both I believe. Even though one may look . Billet Metering Block Conversion Kit Fits Holley 4776-4781 Carburetors $165.95. Connect a vacuum gauge to a manifold vacuum source on the engine. Holley-type vacuum-secondary carbs are more forgiving compared with mechanically actuated double-pumpers; relatively few vacuum-secondary carb sizes can be made to work on a wide . Estimated to ship direct from manufacturer on 10/14/22, pending manufacturer availability. Part Type: . FWIW, I'm very pleased with my $750 tuner-Holley double-pumper 700, extensively reworked by an expert. Also in the kit as an equally Mickey Mouse gear drive that opened primary and secondary throttle plates at a 1:1 ratio. only because a vacuum secondary is more forgiving on the street,i might just try the double pumper anyway. Upgrade it for serious performance using these billet aluminum metering blocks. However a bog will likely follow. +. Zinc-Coated Double Pumper Carburetor Kit. Eelco used to make a kit to convert a vacuum secondary to mechanical. 4160 kits--for 4-barrel vacuum secondary carbs. +. Place all screws, clips, and links to the side for later installation. These last three are for sale cheap to anyone who wishes to prove this wrong. Carburetors, 4150 Double Pumper, 750 cfm, 4-barrel, Square Bore, Mechanical Secondary, Electric Choke, Dual Fuel Inlet, Dichromate, Gasoline, Each. any imput would be welcome, thanks ray If you have ever looked at a Holley parts list and tried to compare a vacuum carb with your double pumper, you would never think of . Description on my camaro: 1980, 355ci, th-400, 4.56 rear end with spool, 12 bolt, tied frames, NO stall torque . May 19, 2011 (Edited) Someone suggested me to replace the big ole Holley 750 I have with an 650 double pumper with mechanical secondary.. Engine I have is a 302 bored .30 over with edelbrock top end package.. Edelbrock 2091 Edelbrock Power Package Top End Kits and headman headers . 4 wheel stock disc brakes. 0-9188 - developed for the 1965 Chevrolet 396/425 and is virtually identical to the 0-3310. The 4160 version replaces the metering block with a thinner metering plate that uses fixed jets. Neil. 1. Since there is no sight plug, or a visible adjustable needle & seat screw, I`m assuming that the float arm must be bent for . Report abuse. As mentioned earlier, by selecting the correct spring for the vacuum chamber, you take care of 90 percent of the tuning of the secondaries. Each Holley carburetor has a specific rebuild kit for its number. pump on the primary or on the secondary and if the nozzle are too small. Now, secondaries that use vacuum to open. Will these work with the Proform billet vacuum secondary base plate . 14 product ratings - 4779 dated 261 Holley double pumper 750 cfm roller linkage carburetor . Description. The 9380 Holley 850cfm has original 30cc acc. The carb only opens the secondary when needed. With such a small engine and a modest 300hp target, I need to run a small carb. I know I asked this before but I would like to see how many different opinions I can get so I make the right decision in choosing either a mechanical secondary carb, or vacuum secondary carb. Windsor, Ontario. . Kit includes necessary gaskets for conversion. with air horn, choke, and metering plate, deleted, have #75 jets in primary, #80 jets in secondary. This is assuming you have it tuned perfectly. in the cockpit. See more product details. Looks like you have the VE series with the vacuum secs.. Overview. You are in effect shoving the fuel/air down . Holley pump cams are compatible and a quicker/stronger shot is usually needed for a engine that has to pull at lower rpms. Reason being that the 850 has a larger bore and venturi and a corresponding lower booster signal so it will need a larger jet to pull the same fuel as the 750. 381. Test 1 is the stock carb's flow capability. I plan on making this comparison again now that the car has 3.31's. 11.90@112 MPH. for more performance. Silver finish with built-in secondary fuel filters. The purpose of the pump shot is to cover up the big air hole you make by opening the secondarys when the engine is not prepared. Helpful. Mechanical vs Vacuum Secondary Carburetors. Now you can balance the idle mixture. The mechanical secondary carburetor is best on a lighter car with radical camshaft and a lower gear and manual transmission . They are more forgiving than a Double Pumper is because they work by sensing engine load. I only use the car for the street. Exactly what Mike said..just because the secondaries can be opened sooner with a double pumper doesn't mean it's faster.My mild combo actually ET's the same and MPH's slightly higher with a 750 vacuum 3310 vs. a 4779 double pumper. How-to adjust the accelerator pump on Holley carburetors to avoid stumbling and hesitation upon acceleration. It offers a 4150 configuration with metering blocks on the primaries and secondaries and also offers four-corner idle control, which is preferable for engines with big single plane intake manifolds and long-duration cams. 700 cfm. Robert E O. A secondary metering block allows a tuner to easily replace secondary jets. You cannot convert a vacuum-secondary carburetor to use mechanical secondaries. . Product details: Component for use on Holley 650 CFM through 800 CFM Double Pumper with Mechanical Secondary applications, and PROFORM Carburetor Main Body, part number 67100C. ANSWER: For street cars the vacuum secondary carburetor works best on mid-weight or heavyweight cars with an automatic transmission. .063 holes.it also had a secondary metering plate.i took the primary and secondary metering blocks off of a 4777-3 holley 650 double pumper, and used those.the pvcr,s were . 4 Barrel 4160 or Demon Vacuum Secondary 600, 650, 750 and 850 E85 Carburetor Kits. Dimensions. D dubs68camaro Registered Joined Nov 6, 2006 1,702 Posts 1974 351W, Holley 670, Tremec 3550, 95 GT rear w/3.27's and Fox conversion. the smallest factory double pumper is a 600cfm from cruising the Holley catelog. HOLLEY OFF ROAD KIT, Spring loaded needle and seat, Cross over vent tube, push-in vent whistle, Holley Off road conversion, 90670, 95670, 90470, 90770. Although Holley employees will take part in . FREE Shipping. The stiffer the spring, the slower the rate of the secondaries opening. Holley offers a tuning kit with seven color-coded springs so that the user can adjust the secondary opening rate to suit the needs of the engine and vehicle. You can not make a real mechanical double pumper very easily out of a vac secondary. Holley does make a mechanical secondary 460cfm that's more the size I need. Since I had to adjust the floats and secondary spring I was just wondering if there were any other tips out there. Considerable mystery surrounds the tuning of the secondaries on a Holley carb. am thinking of going to a holley 750 mech. Read more. Carb Kits. . Click image to zoom . It also has our own large knurled head mixture screws. I believe that the check ball is indeed a "speed bump" for vacuum. You MAY need a new primary throttle shaft and left side linkages as well. The mechanical system will over ride and negate the vacuum feature. Upgrade your Double Pumper with race-ready billet metering blocks! You did away with the vacuum pod. Without the carb id, we just don't know. How to check fuel pump output. Ordered 12.15.67 Delivered 2.1.68: 8T01T, 65C, 289 conversion, hanger queen (sold) . Includes Carb, Fuel Line & Gauge. P. . 4 Barrel Double Pumper 4150 Purple Do It Yourself Kit. 4 Barrel 4150 or Demon Double Pumper 650, 750, 850, 950 and 1050 E85 Carburetor Kits 4150 kit--for 4-barrel 650,700, 750, 850, 950, and 1050 double-pumper carbs: Demon, Holley, Proform and Quickfuel. It should be more responsive with the vacuum secondaries and have better fuel control. Getting a Holley ultra 750 double pumper for my 408 stroker with electric choke. Starting with one idle mixture screw, turn it until you get the highest manifold vacuum reading on the gauge. It doesn't have a secondary squiter and is a single feed 4160. Popular Holley 4150 Styles. $715.86. To access the carb must be inverted. With mechanical secondary's, you would need to go to double pumper to prevent a/any momentary lag as the fuel catches up the to air flow (although mechanical can be done with a kit(s). Test 2 is also with a K&N Stub Stack installed. Brand: Holley. Power valve blow-out protection adds trouble free operation. Part Number: 778-67165C. New (17) from $558.95 & FREE Shipping. Everything Mark said as well in the earlier entry. It will be way too lean with the same jets as the 750. Finish Line Gallery; Tech Tips; Shop; Contact; My Account; . You must tune the holleys: jets, powervalves, accelerator pumps, and secondary springs. This item: Holley 0-80770 4150 770Cfm V-Sec/Ec S-Avenger. This is the idle stop adjustment for most Holley carburetors. 5.0 out of 5 stars Five Stars. I just picked up a 4776 Holley 600 DP at a swap meet, and the carb has the seldom seen LeMans bowls on it. How To Identify Your Holley & Demon Carburetor. The 750 and 780 vaccum 4150 carbs have the same 1 11 . i use the holley hp carbs with no . A 780 is a vacuum secondary main body.3310-1 or any 3310 is a vacuum secondary part and won't work on a dp . Test 2 is about as simple as it gets for more airflow through a Holley carb, especially one that must have a choke and, consequently, a choke horn. Boy, thats way down the list, I missed that one. Holley does this, because there's no way to know the specific engine combination. Aug 21, 2016 #8 C. Crackedback Well-Known Member. Anybody familiar with the oddball LeMans style float bowls for Holley carbs? Look up the factory jetting from Holley and start there. Primary block retains the original vacuum provisions. Only is I would like to know is the different if I have 50cc acc. 4 Barrel Double Pumper 4150 Black Do It Yourself Kit. See all 1 photos. Weight. Holley 0-4779C Model 4150 Double Pumper 750 CFM Square Bore 4-Barrel Mechanical Secondary Manual Choke . The power valve should open at about 2" of vacuum less than cruise or idle's lowest vacuum. pedal or slam it to the floor and the mechanical secondaries are going to open all the way. We used to put a bolt in the linkage to make it open the secondaries about a 1/4" to quicken the opening of them. 710-82570. secondary, double pumper, hp carb. Overview Holley 4150 mech sec carb, Double Pumper . Could be either a bad secondary accellerator pump diaphram or a piece of trash keeping the needle/seat from closing. Doug. May 30, 2010 #4 It is a 4160 600 CFM, non-adjustable float, electric choke, model number 0-80457S Holley 0-80457S - Holley Model 4160 Non-Adjustable Float Carburetors - Overview - SummitRacing.com . Product Q&A View Now. Find Out All You Need To Know Gast Vacuum Pump, Click Here For More Reviews and Get Special Price Today . . The double pumper blocks have provisions for four-corner idle systems. They function on entirely different systems with very few interchangeable parts. Is your carburetor still using 1950's technology? the choke housings' internal plumbing, passages and holes for the critical vacuum pull-off is different. Manufacturer's Part Number: 0-4781C . D. D.Hearne New Member. May 2, 2009. Power went up while mileage ALSO went up 2mpg, over a 600 vac-sec, a 650 double-pump and a 750 vac-sec. Holley 4150 Double Pumper SCREW KIT Screw kit for any 4150 mechanical secondary carburetor including hp and ultra series. Check out the Northwest "4-Eye" BBQ here >>> WWW.NWFOUREYEBBQ.COM. Product details: Component for . Holley offers two different metering block conversion kits. found out the hard way that the choke conversion kit for vacuum-secondary 4160 carbs doesn't work on double-pumpers, duh. $165.95. Vacuum secondary carburetors aren't equipped with a secondary accelerator pump circuit like there is on double-pumper mechanical . With that said I would recommend the Holley 750 CFM Classic Holley Carb 0-80508S Eastwood number 21287. .598 lbs. 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 . 4.5 2.75 .75 in. George P Admin. Tips include: How to check for the clearance be. If you want to be in total control, then get a mechanical secondarie carb and stop the fooling around. CONVERTING A HOLLEY 4160 TO A HOLLEY 4150| Holley single feed to dual feed | Holley Carb Secrets | Today I'll be going through the differences between a dual. Ideally I like mine to be dead even with the top edge, but .020" higher or lower is a good range to be in for good off idle response. 4150 VACUUM SECONDARY HOLLEY SCREW KIT $ 21.99; HOLLEY 30cc ACCELERATOR PUMP KIT $ 19.99; Holley 4150 Double Pumper SCREW KIT 8,654 199. am now using a holley #3310 750 cfm, vaccum secondary carb.

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