Remanufactured Holley Carburetor, 750 CFM, Electric Choke, Dichromate Finish. Holley 0-76750BL 750 CFM Ultra Double Pumper Carburetor, Blue. The engine should "tell" you if it wants more or less fuel. From their roots as the premier carburetor on many factory muscle cars to powering thousands of vehicles across the finish line, the Double Pumper is a great choice whether your Chevelle is burning up . Holley double pumper secondary accel pump Discussion in 'Engine Topic' started by Justin79maro, Nov 23, 2018. Features: Race Series Model with Next Gen Main Body! How to Tune a 750 Double Pumper Holley Carburetor | It ... 750 CFM Carburetor. 600 CFM Double Pumper Dual feed. I'm not sure about a mechanical secondary due to this being a 90% street and 10% strip for fun car. 1969 Cobra Jet - Holley 4779 750 Double Pumper Fuel ... Re: vacuum vs mechanical secondaries. Works very well,very responsive. Additionally, #510-0-4779S and #510-0-4781S feature a 4-corner idle system. Some may disagree but those statements are much more correct than incorrect. 8 product ratings. The mechanically operated, double pumper carburetors seldom come with an electric choke. I have a 750 holley vacuum secondary in my street/strip truck. $718.95. They weigh in at approximately 5 lbs. 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 . Amazon.com: Holley 0-4779C Model 4150 Double Pumper 750 ... Double Pumper carburetors are an American icon when it comes to . Some may disagree but those statements are much more correct than incorrect. I am not worried about gas mileage, i want performance. Now, secondaries that use vacuum to open. Mechanical secondaries with automatic transmission ... Power went up while mileage ALSO went up 2mpg, over a 600 vac-sec, a 650 double-pump and a 750 vac-sec. Double Pumper carburetors are an American icon when it comes to performance carburetors. I've been tuning on my Holley 750 dp mechanical secondary and it was pulling slow in the higher rpm so I started messing with the secondary accel pump and it was bottoming out at wot, making me think that was . holley carburetor 850 double pumper. HOLLEY 750 DP DOUBLE PUMPER CARBURETOR 3752. Holley 4779 - 750 Double Pumper Fuel Mixture Problems 428 ... I used to have a Holley 650 double pumper on my 350 before I stroked it. The OP asked which would give him the most grunt, a 750 vacuum secondary or an 850 vacuum secondary. Vacuum secondaries are best for street cars, mechanical secondaries are best for racing setups. A stock, Holley 4150 series 750 double-pumper carb should have sufficient richness in the idle circuits to run on a performance engine with a mildly-upgraded camshaft, PROVIDED there are no vacuum leaks or other air/fuel delivery issues (filters, float levels etc) AND that the tiny orifice passages within the metering block and main body are . Apparently a carb. This model of carburetor has the square bore flange bolt pattern. $124.95. Quick Tech: How to Properly Set up the Idle on Holley ... #3 . Holley 0-76750RD 750 CFM Ultra Double Pumper Carburetor 5 Stars, 5 product ratings 5. May 19, 2009. - Holley 0-76750BL 750 CFM Ultra Double Pumper Carburetor, Blue. Or, in actuality, lack of vacuum. 2-6 Business day lead time to ship. For additional parts and accessories, see the Holley Performance Parts Catalog. Adjust the fuel level by setting the float first. Holley 4776, 600cfm, 4150, Mechanical Secondaries, Double ... Holley 4776, 600cfm, 4150, Mechanical Secondaries, Double ... $279.95. Help guys!! Holley 0-4779C Model 4150 Double Pumper 750 CFM Square Bore 4-Barrel Mechanical Secondary Manual Choke New Carburetor . C $908.50. Now days, only has one metering block along with secondary metering plate (plates is fixed metering, no replaceable jets). HOLLEY 750 DP DOUBLE PUMPER CARBURETOR 3752. Carburetors, Model 4150 Aluminum Double Pumper, 750 cfm, 4-barrel, Square Bore, Mechanical Secondary, Electric Choke, Tumble Polished, Gasoline, Each Part Number: HLY-0-4779SAE ( 6 ) yes it is a 408 stroker 525 hp and a double pumper with mechanical secondaries ok so i adjusted the carb thanks everybody running much better however how long will my adjustments last people say the idle/air springs are week on holly carbs and you have to adjust often will mine adjustments hold for a few weeks or will i need to get the lock caps for the screws I just removed a Edelbrock 750cfm and installed a custom built Holley 750 double pumper mechanical secondaries no choke. less than a comparable zinc carburetor. Page 1 of 2 1 2 Next > . 4. 5.0 out of 5 stars. 4. Product details: Component for use on Holley® 650 CFM through 800 CFM Double Pumper® with Mechanical Secondary applications, and PROFORM® Carburetor Main . S & H: see site. Running MSD distributor locked out at 32° and 6AL ignition box and BTM to pull timing with boost pressure. The list # is 4778-4 with default jetting of 69 Front (primary) . $77.99 + $15.50 shipping + $15.50 shipping + $15.50 shipping. I'm wondering if I will have to do much to get it to run good on my 383. hence his recommendation. Brand: Holley: Exterior: Machined . Quick View. Manual choke. brand new holley 750 cfm double pumper carburetor,shiny,model 4150,manual choke,mechanical secondaries,compatible with gasoline $1,190.93 $ 1,190 . Topped off with a Holley 750 Double Pumper Part # 4779-10 3129 (mechanical secondary). $77.99 + $15.50 shipping + $15.50 shipping + $15.50 shipping. Holley Double Pumper® carburetors are a perfect performance upgrade for hot street cars and race vehicles. Related: used holley 750 double pumper holley 650 double pumper holley 750 double pumper rebuild kit holley 850 double pumper holley carburetor holley 750 carburetor holley 650 double pumper carburetor edelbrock carburetor 750 cfm carburetor holley 750 vacuum secondary holley 750 double pumper fuel line demon 750 double pumper 5. 0-80528-1 Race Gasoline 750 Mechanical Double -step Down Leg 0-80529-1 Race Gasoline 750 Vacuum Double -step Down Leg . Remanufactured 4bbl 750 cfm Holley 4bbl with mechanical secondaries, manual choke twin 30 cc pumps. Mechanical secondaries. Adjust the idle with the idle screw located on the throttle linkage. Street performance is going to be nearly identical-probably better with the vacuum secondary given the difficulty of properly tuning a double pumper - and the tuning and mileage on a vacuum secondary is going to be easier/better. My Holley 750 double pumper is over flowing gas out the vent tube on the secondary side. 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 and stop sneezing through the carburetor. It seems to run very rich, especially at idle. searching. Features include button torx head throttle plate screws, timed and full vacuum tubes for accessories and tuning, slip link mechanical secondary linkage, and power valve blow out protection! Features: Race Series Model with Next Gen Main Body! No choke assembly, throttle plates and mixture screws move freely, secondary linkage needs lubrication. Applies To Continental U.S. orders only. From . If I were you and wanted a mechanical secondary carb I would run a 750, if you want vacuum secondaries you could run either. Besides needing help with properly adjusting my Holley 650 Double Pumper, I figured like my other topic, Help w/ Adjusting Timing, this could become a sticky for future reference for NYTG Users. of vacuum at 1000 rpm)-blue cam in front . 0-80458SA. I would use a #68 pri jet on a 750 Holley street car. It seems to run very rich, especially at idle. Hello I have a SBC 350, aluminum heads, mild cam, Weiand 142 mini blower with a Holley 750 double pumper blower carb with mechanical secondaries. Double Pumper Dual feed. Comes in our authentic BRIGHT ZINC finish, or Classic Gold. May suit 350cfm 39 700 750 780 800 830 850, Double Pumper, Vacuum Secondary. R&R Only - Rebuild Your Carburetor Service. Shipping $162.61. The mechanical secondary carburetor is best on a lighter car with radical camshaft and a lower gear and manual transmission or on a . The vacuum secondary will have a leaner idle circuit calibration compared to the double pumper. Holley's aluminum 0-4779SA will hold its shine longer and also can be hand polished for a custom look! Hears what I got is a 750(rebuilt) down leg booster, double pumper, mechanical secondary, mechanical dist. Holley's new 0-4779SA is constructed from aluminum which compared to its zinc counterpart. reading. The new Ultra Marine Double Pumper Carburetors have an enhanced fuel curve for optimum performance, with many more features such as aluminum . 750 CFM Dual-Inlet/Four Barrel with Mechanical Secondaries; Square-Type Bore Mount; Features 2-Step Down-Leg Boosters; No Choke; Assembled with 100% New Components; Sold . It's in a '89 Chevy c1500 that weighs around 4000 lbs, truck runs and drives alright just extremely rich. Your new Holley double pumper more than likely has mechanical secondaries which when stuffed to the floor is causing a lean condition as you are forcing the secondaries open. Start the vehicle to set the mixture. The only thing about the double pumper out of the box its calibrated for a engine with a bigger cam since holley puts a richer idle fuel curve on it. Holley 0-4779C Model 4150 Double Pumper 750 CFM Square Bore 4-Barrel Mechanical Secondary Manual Choke New Carburetor. The 650 and 750 CFM models are available in the classic zinc and shiny polished finishes. A double pumper is a mechanical secondary carb with 2 accelerator pumps, one for the primaries and one for the secondaries. Double Pumper carburetors are an American icon when it comes to performance carburetors. I changed a 428 stroker from a 750 vac secondary to 850 double pumper and you couldn't tell it was the same car. Description. Down-Leg Boosters w/o Choke; Tumble Polished Finish. Holley 0-76750BL 750 CFM Ultra Double Pumper Carburetor, Mechanical Secondary, Electric Choke, Red. Holley 0-80458SA 600 cfm Polished Aluminum Universal Street/Strip Carburetor. I can't find any vacuum leaks. Holley Double Pumper® carburetors are a perfect performance upgrade for hot street cars and race vehicles. George P Admin. Brand New. It has no choke, 70 main jets, 6.5 Power Valve, Milled Choke, and polished venturies. 4.5 average based on 8 product ratings. A local engine builder put everything together for me and it runs great, but I'm having difficulty dialing in the carburetor. I have less than 1000 miles on this build. I tried a buddy's mech sec. Everyone chiming in with double pumpers or fuel injection is failing to answer the OP's question. 8 product ratings. My combo is .222/.226 @ .050 hydraulic cam, home ported 351W 1.94/1.54 heads (not finished porting yet), edelbrock RPM intake, 9.5:1 compression, t-5, 3.73:1 gears in a 93 mustang. The Double Pumper gets its name from the twin accelerator pump outlets (arrows) for both the primary and secondary throttle bores. 95 Get it as soon as Tue, Jan 4 Brand: Holley. Holley 4150 Hp Series 750 Cfm Double Pumper Hp Carb Carburetor List 80528 - 2 $525.00 These last three are for sale cheap to anyone who wishes to prove this wrong. Your new Holley double pumper more than likely has mechanical secondaries which when stuffed to the floor is causing a lean condition as you are forcing the secondaries open. A double-pumper (mechanical-secondary) carb is probably the best choice if the majority of the following factors apply to your combo: Off-road/all-terrain racing Drag racing, road racing, and oval . Selling my Holley 750 double pumper mechanical secondary. Electric Choke Vacuum Secondaries-4160. Has one accelerator pump but dual inlet bowls. It has great throttle response. Adjust the accelerator pumps. Remanufactured Holley Carburetor, Double Pumper, 750 CFM with Manual Choke, Dichromate Finish. It was a great set up an ran just fine. This is a 700 CFM Holley 4150 body with mechanical secondaries and an added electric choke. $997.92. I understand that is a 650 CFM,mechanical secondaries,known as a double pumper. So if you are looking for a good upgrade for your engine this is it. 93 Get it Tuesday, Dec 28 - Monday, Jan 3 I guess the machinist had good experience with this specific carb. Freshly rebuilt 454 Hei distributor Holley 750 double pumper Re gasketed Comes with two boxes of spare parts Gen 4 Comes with th400 with b&m shift kit for asking price Tags ls sbc bbc swap lq4 lq9 4.8 5.3 6.0 350 305 383 big block small block . I have my carb off and am chasing a tip-in stumble when I get back on the gas after a gear change. 750 cfm holley double pumper - $500 (Corona) . Among the most popular 750 cfm Double Pumper Holleys is the traditional PN 0-4779C. 750 on my truck once and there was no real improvement. (3) 3 product ratings - Holley 3310-3 4160 750 CFM 4 Barrel Aluminum Street Carburetor Vacuum Secondary. From their roots as the premier carburetor on many factory muscle cars to powering thousands of vehicles across the finish line, the Double Pumper is a great choice whether your Nova is burning up the . Used for high performance or larger displacement engines, they are infinitely tunable. 750 CFM Carburetor. Start the engine and allow it to warm up to operating temperature. Holley Double Pumper carburetors are a perfect performance upgrade for hot street cars and race vehicles. I have a 750 double pumper (part #4779-9) although it now has a 750 HP main body on it (part # 134 300C). Dual accelerator pumps. Holley four barrels like this 750 cfm 0-3310C have a small set screw located beside the passenger side throttle bore shaft bore (on the base plate of the carburetor, so you'll have to flip it over). $24.01 shipping. Item #: HOL0-76750RD. Not a custom carb though. I just started my 78 Trans Am after a 2 year sleep. holley carburetor 850 double pumper. Free FAST Shipping, Free Returns, Expert Tech Support. 3310 - 750 cfm is the vacuum secondary carb that has been around for years. better. 4 Stars, 2 . I have recently purchased a nice double pumper 750 Holley with Mechanical Secondaries from a Friemd or a Friend. saving. I drive it maybe once a week around town, but bring it to the track on the weekends to run the points series. They are same and work the same and if you don't get the secondaries open, will get the same mpg. Currently unavailable. 2 product ratings. Order either one and don't look back. This is primarily a street car - i know that the double pumpers are worth about 10 hp over the vacuum secondary. 4479 - 750 cfm double pumper is Holley's first attempts at getting a better carb for the hot rodders. April 15, 2008, 06:42 PM. Double Pumper carburetors are an American icon when it comes to . 1972 Chevelle, MJ 467, 200-4r non-lockup, Moser 12 bolt 3.73 If you have a spreadbore style intake manifold, you will need an adapter to install this carburetor. Double Pumper carburetors are an American icon when it comes to performance carburetors. A full description of the operation and part components of the Holley 4150 mechanical secondary four-barrel carburetor. I can't find any vacuum leaks. Or, AED advised me that one of their 750 mechanical secondaries will work perfect out the box with minimal tuning. They are more forgiving than a Double Pumper is because they work by sensing engine load. Only show this user. The 650 and 750 CFM models are available in the classic zinc and shiny polished finishes. A 750 double pumper Holley carburetor is a high performance carburetor that incorporates two accelerator pumps that are manually operated. . . I put a new needle and seat. I've done some digging and have come up with the usual internet confusion. Mfg Part #: 0-76750RD. Right out of the box they'll be a bit rich, due to your altitude. A proper mix is a "froth" which is air and fuel bubbled together. Dual Inlet 4-Barrel w/ Mechanical Secondaries. There was an . The car surges at low rpm. This is an HP version carburetor where the choke housing is removed for smoother air inlet into the carburetor. This carb. </p> First, there are no differences in the primary sides of a 750 vac secondary and a 750 double pumper Holley. Out Of Stock. Select Options. Details about Holley 4776, 600cfm, 4150, Mechanical Secondaries, Double Pumper Carburetor. Mechanical secondaries Manual choke 750 cfm Barely used Contact me if interested, I will send numbers and more pictures loading. I simply replaced it with a Holley 600. is recommended to me by the machinist who is building my 383. Holley upgraded their two most popular sizes of double pumper with electric chokes. Holley 4150 - 750 CFM Carb Features; Mechanical secondaries Dual accelerator pumps Adjustable air bleeds; No choke Contoured venturii inlet for increased airflow Four corner idle for precise idle control Dual feed fuel inlet 1 timed (spark) port, 1 full vacuum, and 1 PCV port The new Ultra Marine Double Pumper Carburetors feature all aluminum construction and are equipped with metering blocks and a base plate made from 6061-T6 billet aluminum. The plugs tell the tale. Completely refurbished 4779 Holley has all new parts and non stick gaskets. A local engine builder put everything together for me and it runs great, but I'm having difficulty dialing in the carburetor. 4 Stars, 2 . 750 CFM Dual-Inlet/Four Barrel with Mechanical Secondaries; Square-Type Bore Mount; Features 2-Step Down-Leg Boosters; No Choke; Assembled with 100% New Components; Sold . Jul 29, 2019. Click to see full answer. I was think about getting a 750 double pumper with a choke on it, but not sure if it's worth the price to buy one. A local engine builder put everything together for me and it runs great, but I'm having difficulty dialing in the carburetor. Info. Carb comes ready to run. Holley Double Pumper carburetors are a perfect performance upgrade for hot street cars and race vehicles. The . It is a stage 3 chuck nuytten carburetor. I run a 650 holley mechanical secondary carb. Barrels: 4 Billet Color: Black Booster: Down Leg Brand: Holley CFM: 750 Choke: Electric Emission Code: 3 Finish: Shiny Fuel: Gasoline Fuel Inlet: Dual Material: Aluminum Model: 4150 Primary Main Jet: 73 Primary Power Valve: 6.5 Primary Pump Nozzle Size: 31 Product Type: 4150 Model Carburetor Secondaries: Mechanical Secondary Main Jet: 80 Secondary Pump Nozzle Size: 28 Supercharged Application: No You'll be happy with either the Holley or QFT double pumper. . 5 Stars, 5 product ratings 5. JEGS Easy Kits are designed by JEGS professionals so you get . Holley 0-4779SAE - Holley Model 4150 Aluminum Double Pumper Carburetors Carburetors, Model 4150 Aluminum Double Pumper, 750 cfm, 4-barrel, Square Bore, Mechanical Secondary, Electric Choke, Tumble Polished, Gasoline, Each That way when you kick open the secondaries there is no bog or pop back. Amazon. I know, I. Easy job to drop down a couple of jet sizes on both primary and secondary sides till the plugs look right. Down-Leg Boosters w/o Choke; Tumble Polished Finish. The big advantage to a double pumper in my book is that you can leave the line with all the throttle blades wide open. My float is good, i stuck it in a bucket full of water and it stayed a float. Carburetors, Model 4150 Aluminum Double Pumper, 750 cfm, 4-barrel, Square Bore, Mechanical Secondary, Electric Choke, Tumble Polished, Gasoline, Each Part Number: HLY-0-4779SAE ( 6 ) They are all good carbs but each carb fills a niche in engine design, so comparing a holley 600 vacuum secondary single line dual feed to a edelbrock 750 with a secondary air valve to a holley 750 double pumper is really a moot point, whatever carb works best on your combo is the best carb for your combo. Topped off with a Holley 750 Double Pumper Part # 4779-10 3129 (mechanical secondary). Holden, Ford, Chrysler, Chev, Valiant, for more info call or text me on 750 Holley Double pump over flowing on secondary side, Gas everywhere!! 5 out of 5 stars. eBay. with excellent throttle. Depending on the weight of your vehicle and what rear gears you have you might be able to use a . I have less than 1000 miles on this build. For street cars the vacuum secondary carburetor works best on midweight or heavyweight cars with an automatic transmission. Carburetor Numerical Listing for Part #0-76750RD. I've been really happy with it, but it took a lot of tunig to get it where it is now. <p>holley 750 </p><p>This carburetor only has about 3 hours of run time. List #4779-2 Mechanical secondaries, no choke, dual feed inlets. Dual Inlet 4-Barrel w/ Mechanical Secondaries. 1700-2500. Quick Fuel Br-67320 Street Carburetor Mechanical Secondary 750 $522.95 View Item Details New Good 750cfm Double Pumper Carburetor Manual Choke With Fast Ship By Dhl $211.09 View Item Details . all in by 2900-3000 rpm timing at 36 degrees-front air ideal screws out about 3/4 to 1 turn-fuel at bottom of sight hole-front jets #70-rear jets #80-squirters front.031 and rear .031-5.5 power valve-(9inch. Part Number: NCR-80508C. It's been sitting on the shelf for 2 years in a box. FWIW, I'm very pleased with my $750 tuner-Holley double-pumper 700, extensively reworked by an expert. Item is Out of Stock Notify When Back in Stock. 4.5 average based on 8 product ratings. Plus I dont trust my tuning abilities with a double pumper. We have a more engine size sensitive 750 double pumper on our ZZ383/425 and it's nice, not too big. $630.95. Vacuum secondaries are best for street cars, mechanical secondaries are best for racing setups. Vacuum secondary diaphragm springs (if applicable), which vary secondary opening, are available under Holley P/N 20-13. Holley upgraded their two most popular sizes of double pumper with electric chokes. Holley 4776, 600cfm, 4150, Mechanical Secondaries, Double Pumper Carburetor | eBay Skip to main content It can replace Holley, Edelbrock, Carter AFB, and Autolite style carburetors with 5 3/16" x 5 5/8" bolt pattern. Do I need to swap any. I wouldn't hesitate to run a mechanical secondary carb on your brother's truck. Holley 650CFM Double Pumper Aluminium Carburettor - HO0-4777SA. THK 600 five-speed 3.50 gears in the rear Strange 31 spline axels Ford 9" Track-Lock I have less than 1000 miles on this build. Mechanical secondaries means your foot controls the opening of the secondary throttle blades." I personally have a 650 Holley Ultra double pumper on my 351w, mechanical secondaries and electric choke and love it, definitely wouldn't ever go back to vacuum secondaries. 4.8 out of 5 stars 14 ratings | 6 answered questions . How to Tune a 750 Double Pumper Holley Carburetor Remove the air cleaner. writing. So I have a Holley 650 Double Pumper, with Mechanical Secondaries and an Electronic Choke. Topped off with a Holley 750 Double Pumper Part # 4779-10 3129 (mechanical secondary). 100% wet-flow tested and calibrated, these classic 4-bbl carbs have manual choke, mechanical secondary, power valve blowout protection, center-hung floats, dual fuel inlets, dual accelerator pumps, dual metering blocks, and zinc finish for extra durability. I would still be using it but the 388 likes a 750 vac sec. $309.95. It was built for a 406 chevy small block with 600 hp. By turning the screw clockwise approximately 1-1/2 turns, the throttle blade on the secondary will open slightly. Details about Holley 4776, 600cfm, 4150, Mechanical Secondaries, Double Pumper Carburetor. UPC #: 090127664698. We don't know when or if this item will be back in stock. Various Holley 2 and 4 Barrel parts prices from $1 each. Holley Double Pumper® carburetors are a perfect performance upgrade for hot street cars and race vehicles. It stumbles off the line and i have recently rebuilt . 5. brand new holley 750 cfm double pumper carburetor,shiny aluminum,model 4150,electric choke,mechanical secondaries,compatible with gasoline $623.95 $ 623 . This has the factory Holley calibration and jetting. Off the shelf. Blades wide open in a box i can & # x27 ; s mech sec still using... When i get back on the gas after a 2 year sleep by the machinist who building. About gas mileage, i want performance are designed holley 750 double pumper mechanical secondaries jegs professionals so get. Am after a 2 year sleep out the vent tube on the weekends to run the Series... Performance or larger displacement engines, they are more forgiving than a double Pumper engine this is it holley 750 double pumper mechanical secondaries https... Blades wide open > this carb book is that you can leave the line all! With this specific carb first, there are no differences in the primary sides a... 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Throttle blades wide open hp over the vacuum secondary the hot rodders vacuum at 1000 rpm ) cam! //Askinglot.Com/How-Does-A-Holley-Vacuum-Secondary-Work '' > How does a Holley 650 double Pumper is because they work by sensing engine load hand for. Are worth about 10 hp over the vacuum secondary this is a Holley double Pumper® carburetors are an icon. I will send numbers and more pictures loading enhanced fuel curve for optimum performance with. With Holley 750 double Pumper is over flowing on... < /a > the car surges low! The most popular 750 CFM Barely used Contact me if interested, i want performance vacuum leaks street Carburetor secondary. Any vacuum leaks trust my tuning abilities with a double Pumper Carburetor Tune a 750 vac secondary a. Fixed metering, no replaceable jets ) the gas after a 2 year.... 6.5 Power Valve, Milled choke, 70 Main jets, 6.5 Valve. Tube on the weekends to run good on my 383 able to use a # 68 pri jet a. Or vacuum secondary locked out at 32° and 6AL ignition box and BTM to pull with! Authentic BRIGHT zinc finish, or classic Gold larger displacement engines, they are tunable! Ratings - Holley 0-76750BL 750 CFM square bore flange bolt pattern the 650 and CFM. And more pictures loading line and i have a 750 vac-sec camshaft and a 750 vac and! > April 15, 2008, 06:42 PM gears you have you might be able use! Rear gears you have holley 750 double pumper mechanical secondaries Holley 650 double Pumper carburetors seldom come with an electric choke screw clockwise 1-1/2! You & # x27 ; t find any vacuum leaks with either the Holley performance parts Catalog //www.pro-touring.com/threads/76648-Help-guys! -750-Holley-Double-pump-over-flowing-on-secondary-side-Gas-everywhere... Blade on the throttle linkage the gas after a gear change the choke housing is for! The vent tube on the secondary side, gas everywhere!! -750-Holley-Double-pump-over-flowing-on-secondary-side-Gas-everywhere!... Tell & quot ; tell & quot ; you if it wants more or less fuel > How Tune! Free FAST shipping, free Returns, Expert Tech Support block with 600 hp?! 650 double-pump and a 750 vac-sec Holley 4bbl with mechanical secondary applications, and PROFORM® Main., you will need an adapter to install this Carburetor radical camshaft and lower. Over flowing on... < /a > April 15, 2008, 06:42.! On secondaries | StangFix.com < /a > 5 out of 5 stars 14 |... > 750 Holley double Pumper® with mechanical secondary, mechanical secondaries and an Electronic choke s question ''... Mech sec is over flowing on secondary side, gas everywhere!!!... Or if this item will be back in Stock would use a the vacuum secondary diaphragm springs ( if )! Qft double Pumper carburetors are an American icon when it comes to performance carburetors rebuilt ) down leg,... An added electric choke are looking for a custom look can leave the line with all the throttle linkage infinitely. Big advantage to a double Pumper 750 CFM square bore 4-Barrel mechanical carb... You kick open the secondaries there is no bog or pop back over vacuum! //Www.Hotrodders.Com/Threads/Holley-4777-Carb-Questions.51067/ '' > Holley transfer slot adjustment on secondaries | StangFix.com < /a > April 15 2008. Three are for sale cheap to anyone who wishes to prove this wrong to performance carburetors is building 383... Are infinitely tunable > this is a Holley double Pumper® carburetors are an American icon when it to. Vac secondary and a 750 vac-sec Power Valve, Milled choke, Dichromate finish a stumble., especially at idle much for 383 shipping, free Returns, Tech...: //www.stevesnovasite.com/threads/holley-750-vaccum-secondary-or-750-mech-secondary-double-pumper.146820/ '' > Holley transfer slot adjustment on secondaries | StangFix.com < /a > may 19,.. Has no choke, Dichromate finish the points Series double Pumper® with mechanical secondaries, double Pumper?... Blades wide open manual choke 750 CFM 4 Barrel aluminum street Carburetor vacuum diaphragm! And am chasing a tip-in stumble when i get back on the secondary side gas. Best on a 454 send numbers and more pictures loading everywhere!! -750-Holley-Double-pump-over-flowing-on-secondary-side-Gas-everywhere!! -750-Holley-Double-pump-over-flowing-on-secondary-side-Gas-everywhere! -750-Holley-Double-pump-over-flowing-on-secondary-side-Gas-everywhere! High performance or larger displacement engines, they are infinitely tunable 4776, 600cfm, 4150, mechanical and... Shipping, free Returns, Expert Tech Support s first attempts at getting a better carb for the hot.... Send numbers and more pictures loading the Jalopy Journal < /a > out! Choke twin 30 cc pumps will have a spreadbore style intake manifold, you will need an to!, Dichromate finish icon when it comes to performance carburetors 1-1/2 turns the! Of a 750 vac sec Easy job to drop down a couple jet... April 15, 2008, 06:42 PM it comes to Body with mechanical secondary, mechanical secondaries holley 750 double pumper mechanical secondaries as! Hp version Carburetor where the choke housing is removed for smoother air inlet into the.. In the classic zinc and shiny polished finishes box and BTM to pull timing with pressure! Allow it to the double pumpers or fuel injection is failing to answer the OP & # x27 ; hesitate! Pn 0-4779C secondary will have a Holley double pump over flowing on <... The fuel level by setting the float first much for 383 about gas mileage, i have... 650 double Pumper carb especially at idle P/N 20-13 a tip-in stumble when get! > 750 or 850cfm on a 750 too much for 383 2 Next gt... S first attempts at getting a better carb for the hot rodders???. | 6 answered questions a street car - i know that the double Pumper < /a Help! R & amp ; r only - Rebuild your Carburetor Service and an electric... It stumbles off the line with all the throttle blades wide open mech sec a 2 sleep! Holleys is the traditional PN 0-4779C ( rebuilt ) down leg booster, double Pumper Carburetor 750... Is failing to answer the OP & # x27 ; s first attempts at getting a better for! Vaccum secondary or 750 mech with an electric choke non stick gaskets Series Model with Next Gen Body...