The carbs are holley 80575S 600cfm mechanical secondary double pumper supercharger carbs for my 671 blown chevy 350. Holley 0-4781S - Holley 4150 Double Pumper Carburetors. okay i'm getting ready to swap the edelbrock TR1-X tunnel ram and dual holley 660 4bbls for a edelbrock scorpion and holley 850DP. okay i'm getting ready to swap the edelbrock TR1-X tunnel ram and dual holley 660 4bbls for a edelbrock scorpion and holley 850DP. Lowest Price Guarantee. Estimated Ship Date: 2/9/2022 if ordered today. Jegs Braided Fuel Line Kit. Top Rated Seller Top Rated Seller. If there is a fly in the Holley ointment, it's setting up the idle. Carburetor, Model 4150, 850 cfm, Square Bore, Manual Choke, 4-Barrel, Dual Inlet, Dichromate, Each. The Double Pumper is available in a gold dichromate or tumble polished shiny finish and features dual accelerator pumps for additional fuel under initial acceleration; mechanical secondaries for great performance; dual feed fuel inlets for constant high volume fuel delivery and a manual choke for easy control of engine warm up. I have a 750 double pumper (part #4779-9) although it now has a 750 HP main body on it (part # 134 300C). Jul 29, 2019 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. Works very well,very responsive. Brand New. $ $629.95 Carburetors and Throttle Bodies \ 4150 Series Carburetors \ 850 CFM 4150 Series Carburetors 0-4781S. fuel pressure holds at 5.5 psi. HOLLEY 850 CFM DOUBLE PUMPER CARBURETOR | MANUAL CHOKE | MECHANICAL SECONDARIES | 4150. $585.34. Look at the LM-1 log I posted, the secondaries are opening fully just rapping the throttle open and closed with no load. $585.34. 9. . There are lots of different carbs in both categories, an old Carter 450 with mechanical secondaries will get a lot better mileage than a Holley 850 with Vaccuum secondaries on nearly any application. holley secondary bog. FREE Shipping. - QFT 850 Double pumper - No choke at all - Mechanical secondaries Recommended by Mechanic . basically brand new holley 850 double pumper manual choke mechanical secondary's ran once on my motor but it's to big $300 obo. I have my carb off and am chasing a tip-in stumble when I get back on the gas after a gear change. Mfg Part #: 0-4781SA. View Item Details. protection. These Holley Classic Double Pumper 4-barrel carburetors sport the classic Holley "gold" Dichromate finish. 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 you are burning up the . Secondaries Shared Specifications Dual metering blocks Dual-feed fuel inlets Center-hung floats Manual choke Power valve blowout protection Mechanical secondaries Dual . Holley Double Pumper® carburetors are a perfect performance upgrade for hot street cars and race vehicles. Holley 0-4781C - Holley 4150 Double Pumper Carburetors. Holley 0-4781C Model 4150 Double Pumper 850 CFM Square Bore 4-Barrel Mechanical Secondary Manual Choke New Carburetor 5.0 out of 5 stars8 ratings | 3 answered questions $799.00$799.00 Enhance your purchase About this item This fits your . I usually use a Holley 750DP as a starting point when I build mild motors. ( 6 ) Estimated Ship Date: 2/14/2022 (if ordered today) Free Shipping. The throttle response was way better and overall power seemed to be more . Its so rich there is a cloud in the garage, and you cant even stand in there while its running with both . i know i'm going down alot on cfm and it'll bring back some low end torque that i lost with the tunnel ram .do you think i'll need to jet the 850 dp down so it'll work on my motor or ?? Holley 0-4781SA 850 CFM Double Pumper Carburetor, Mechanical Secondary, Manual Choke, Shiny Aluminum. They are more forgiving than a double pumper is because they work by sensing engine load. If the throttle response and acceleration is not crisp and clean, then the pump size may be too large. Estimated Ship Date: 2/14/2022 (if ordered today) Pump with straight type nozzle size .031. I just removed a Edelbrock 750cfm and installed a custom built Holley 750 double pumper mechanical secondaries no choke. You may have to register before you can post: click the register link above to proceed. Holley 0-4781S 850 CFM Double Pumper Carburetor, Mechanical Secondary, Manual Choke, Shiny. A proper mix is a "froth" which is air and fuel bubbled together. As long as you don't actuate the secondaries, it uses no more fuel than a vacuum carb with the same size primary throttle bores, booster type, jetting and idle mixture. [*]Holley 4150 Double Pumper Carburetor [*]850 CFM [*]Shiny Finish; Features and Benefits [*]Mechanical secondaries [*]Dual accelerator pumps . $29.50. I run a 650 holley mechanical secondary carb. The 830 Holley double pumper was developed to get max flow into an engine running in classes where throttle bore size was limited to 1-11/16", I believe. Item is Out of Stock Notify When Back in Stock. Double Pumper carburetors are an American icon when it comes to performance carburetors. If I were you and wanted a mechanical secondary carb I would run a 750, if you want vacuum secondaries you could run either. Jump to Latest Follow . ( 1 ) Estimated Ship Date: 1/11/2022 (if ordered today) Free Shipping. I changed a 428 stroker from a 750 vac secondary to 850 double pumper and you couldn't tell it was the same car. Double Pumper carburetors are an American icon when it comes to performance carburetors. Made from High-Quality Billet Aluminum. Learn more. Some of our favorites are the Holley 850 CFM Double-Pumper Carburetor, Holley Street Avenger 770 CFM Vacuum-Secondary Carburetor, and Edelbrock 1906 AVS2 650 CFM 4-Barrel Carburetor. Actually, on model 3310 Holley's using either the 750 or 780 rating is correct and depends on what you want to call it. Now would be the perfect time to upgrade to a Holley Powershot air filter (Holley P/N 120-146). 539.95. Product details: Component for use on Holley® 650 CFM through 800 CFM Double Pumper® with Mechanical Secondary applications, and PROFORM® Carburetor Main . We also know you're going to want to keep either the Holley Renew Kit or Edelbrock 1477 carb rebuild kit on hand if you pick up any carbs from the appropriate . Find many great new & used options and get the best deals for Holley 4781 Carburetor Carb 850 CFM Double Pump Mechanical Secondaries Rebuilt at the best online prices at eBay! If you have a double-pumper carb, the secondary accelerator pump nozzle must supply fuel for a sufficient time, so that the secondary main nozzles can begin to deliver fuel to the engine, after the secondary throttle plates are open. Holley usually puts in ones that are way to stiff and won't allow the secondaries to fully open. Buy Holley 0-4779C Model 4150 Double Pumper 750 CFM Square Bore 4-Barrel Mechanical Secondary Manual Choke New Carburetor: Carburetors - Amazon.com FREE DELIVERY possible on eligible purchases I have run several of them over the years and they have performed well. Pump on the primary with straight type nozzle .028 and on the secondary I have the standard 30cc acc. Since Holleys are so easy to adjust, it's also easy to adjust them totally wrong. 2 product ratings - Holley 0-82851SA 850 CFM Double Pumper Aluminum Street HP Carburetor. It's in a '89 Chevy c1500 that weighs around 4000 lbs, truck runs and drives alright just extremely rich. This motor was built, broken-in and dyno'd at the same shop. Save used holley 750 double pumper to get e-mail alerts and updates on your eBay Feed. Out Of Stock. Holley 850 CFM Ultra Double Pump Holley Carb - Polished Finish HLY-0-76850BK (0) Reviews: Write first review Description: Shiny with black anodized billet aluminum metering blocks/base plate for good looks and true gasket sealing Ultra Double Pumpers feature an Optimized street/strip calibration that works out-of-the-box Carburetor, Ultra Double Pumper, 850 cfm, Hard Core Gray, Black Anodized, Electric Choke, Each. This is a 700 CFM Holley 4150 body with mechanical secondaries and an added electric choke. I have a 460 mild cam with a holley 750 vac secs. Contact the seller. Available in 650, 750, 850, and 950 CFM versions. A Holley 750 or 850 double pumper (true) with mechanical secondaries will work fine. 850 Holley Street HP Double Pumper. 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 you are burning up the . Carburetors, 4150 Double Pumper, 750 cfm, 4-barrel, Square Bore, Mechanical Secondary, Electric Choke, Dual Fuel Inlet, Dichromate, Gasoline, Each. Top Rated Seller. Check if this part fits your vehicle. Don't leave out the power brake booster. Given the sheer numbers of carburetors made since the 1950s, you know they work. need tips & pics if possible on adjusting the secondary blades. Item is Out of Stock Notify When Back in Stock. Holley 0-4781C 850 CFM Double Pumper Carburetor Manual Choke Mech. Add To Cart. Brand New. You should be able to adjust for max RPM or vacuum at idle, then jog between the idle speed and mixture to tune the mixture for max RPM at your desired idle speed, ENGINE HOT. Holley 4150 Double Pumper Mechanical Secondary Carb Carburetor Overview Tutorialhttp://www.jegs.com/p/Holley/Holley-Street-HP-Carburetors/757757/10002/-1Stre. Mechanical secondaries for awesome tire turning performance. holley street strip double pumper 850 cfm mechanical secondary carb.big blocks or hot small blocks Price: $554.95 Holley Aluminum Ultra HP Carburetor 750CFM The venturi to throttle bore with an 830 Holley works out to 1.08 . Then just "touch" the idle screws towards the lean side. What more could you want? Carburetor Base Plate. When I stomp on it the secs open up and sucks the gas up. Jump to Latest Follow . Recheck to assure all existing vacuum hoses are attached properly. For most situations I agree that Vaccuum secondaries are hard to beat for street use, but that doesnt mean that mechanical is a bad idea. I've done some digging and have come up with the usual internet confusion. +C $47.44 shipping estimate. View Item Details. Find Holley Carburetors 850 CFM, Mechanical Secondary Type and get Free Shipping on Orders Over $99 at Summit Racing! Carburetor, Gasoline, Model 4150, Universal, 850 cfm, 4-Barrel, Manual Choke, Dual Inlet, Silver, Each . 850 CFM Double Pumper Carburetor - Manual Choke Mechanical Secondaries. Make sure this fitsby entering your model number. Understanding Holley Vacuum Secondary Carburetors. View Item Details. The only real variable between the two carbs is the secondaries, and this perfectly sums up the difference in the way the car behaves. Quick Fuel Br-67259 850cfm Street Carburetor Electric Choke Double Pumper. $619.95. Holley Double Pumper® carburetors are a perfect performance upgrade for hot street cars and race vehicles. Estimated Ship Date: 1/11/2022 (if ordered today) Free Shipping. $40.00. Applies To Continental U.S. orders only. Item #: HOL0-4781SA. Needless . or Best Offer. Holley 0-76850BK 850 CFM Ultra Double Pumper Carburetor Electric Choke Black. Vaccum secondaries = secondaries operated by primary venturi vacuum (different from manifold vacuum, it is the same as the "signal" that pulls fuel into the primaries, it increases in proportion to air flow through the primaries) 1.750" Throttle Bore Holes. Holley 0-4781S 850 CFM Double Pumper Carburetor, Mechanical Secondary, Manual Choke, Shiny. Everyone chiming in with double pumpers or fuel injection is failing to answer the OP's question. As succinctly as possible, the double pumper is a Holley carburetor with 4 barrels, two accelerator pumps (hence the double pumper monicker), and a mechanical linkage connecting the primary and secondary sides of the carb. 8. 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. . It has great throttle response. 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. Mfg Part #: 0-4781SA. Applies To Continental U.S. orders only. C $858.68. . The Double Pumper is available in a gold dichromate or tumble polished shiny finish and features dual accelerator pumps for additional fuel under initial acceleration; mechanical secondaries for great performance; dual feed fuel inlets for constant high volume fuel delivery and a manual choke for easy control of engine warm up. Plug any fittings not used. Holley Ultra Double Pumper Carburetor Kit Ultra Double Pumper Carburetor 850 cfm with Electric Choke. .the 660's are a mechanical secondary but does not have a accelerator pump . Camaro's were all delivered with a 780 vacuum secondary carb to the dealers, but, all those carbs were changed by an FDM (Factory Directed Modification) to an 850 double Pumper. .the 660's are a mechanical secondary but does not have a accelerator pump . Item #: HOL0-4781SA. This weekend he gets it running and it is pig rich at idle. Holley Double Pumper? Holley 850 double pumper with mechanical secondaries; Comp 305H cam (.525/.525) 305 Duration (253 @.50) 110 lobe separation; 1 7/8 headers 3" exhaust; 10.5:1 forged pistons; 13* timing; 727; 4000 rpm PTC convertor; 3.91 gears; 29" tall tires; Now that you have helped me set the timing, there is still two more drive ability issues which must be . Let's put a 750 cfm Holley HP carburetor on this engine (PN 82751). - Holley 750 Double Pumper - Electric Choke - Mechanical secondaries - (mechanic says vacuum wont work well and should go mechical due to cam it has) QFT Option Street option - 325.00. Out Of Stock. i know i'm going down alot on cfm and it'll bring back some low end torque that i lost with the tunnel ram .do you think i'll need to jet the 850 dp down so it'll work on my motor or ?? brand new holley 750 cfm double pumper carburetor,shiny aluminum,model 4150,electric choke,mechanical secondaries,compatible with gasoline $623.95 $ 623 . UPC #: 090127689356. HOL0-4781S. Double-pumper = manual secondaries; you floor it, they open. + $3.50 shipping + $3.50 shipping + $3.50 shipping. ( 6 ) Estimated Ship Date: 2/9/2022 if ordered today. Holley 0-4781S - Holley 4150 Double Pumper Carburetors. For many applications, choose from a carburetor by itself or two kit options: one with a braided fuel line or another with both a fuel line and JEGS liquid-filled fuel pressure gauge. A double pumper will dump gas all the time . 749.95. I would use a #68 pri jet on a 750 Holley street car. before. $819.44. The engine should "tell" you if it wants more or less fuel. I have a running rich & want to see if this could be the culprit..Thanks Feb 1, 2011 #2 sec. 850 cfm with Electric Choke. HOLLEY 750 DOUBLE PUMPER 4 BARREL CARBURETOR R84028 -2110. You won't go wrong with an 850 Double Pumper. 7. Start the engine and check the fuel lines and inlet fitting for possible leaks. Why I want to know is that I change the gasket on my 9380 Holley 4150 850cfm with mechanical secondaries and annular booster and find out that I have a 50cc acc. Mechanical Secondary; Made from Quality Billet Aluminum. Secondaries 4 out of 5 stars (5) 5 product ratings - Holley 0-4781C 850 CFM Double Pumper Carburetor Manual Choke Mech. Running MSD distributor locked out at 32° and 6AL ignition box and BTM to pull timing with boost pressure. Quick Fuel 850 Cfm Carburetor Carb Red Black Double Pumper Br-67332 Custom. Free Shipping. It's in a '89 Chevy c1500 that weighs around 4000 lbs, truck runs and drives alright just extremely rich. Ultra Double Pumper Carburetor. the carb is a vac secondaries holley 750. Carbs include center hung float bowls, dual fuel inlets, mechanical secondaries with dual accelerator pumps, four-corner idle, dual metering blocks, manual choke, and power valve blow-out protection. + shipping + shipping. Holley Carbs Carb Carburetors Carburators Kits Holley 750 700 600 625 850 800 650 CFM Electric Choke, Vacuum Secondary, Model 4150 , Dual feed QuickFuel 650CFM Carb Mechanical Secondary Holley Electric Choke Double Pumper Holly 650 CFM 4 Barrel Double Pumper Carburetor Manual Choke with fuel line Fuel line fittings and vacuum plugs had been . The larger plenum volume created by the spacer can require more fuel from the accelerator pump circuit. So, my brother-in-law just got himself a 440 built for his 69 r/t Charger. Quick Fuel Sq-850 850 Double Pumper Mechanical Secondary Carburetor Custom 4u. Part Number: HLY-0-4781C. Ultra Double Pumper Carburetor Kit. 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! Intended for lightweight vehicles with manual trans or automatics with high stall & low gearing. Brand New Holley 700 CFM Double Pumper Carburetor, Shiny Aluminum, Manual Choke, Model 4150, Mechanical Secondaries, Compatible with Gasoline (Part #0-4778SA) The Double Pumper is designed for use on lightweight vehicles with a manual transmission or an automatic transmission with a high stall & low rear end gears. We have a more engine size sensitive 750 double pumper on our ZZ383/425 and it's nice, not too big. I have a # 4150 holley 750 dp mech. Holley 0-4781SA 850 CFM Double Pumper Carburetor, Mechanical Secondary, Manual Choke, Shiny Aluminum. + shipping. Dual accelerator pumps for additional fuel under initial acceleration. 1972 Chevelle, MJ 467, 200-4r non-lockup, Moser 12 bolt 3.73 Estimated to ship direct from manufacturer in 24hrs. I actually just swapped my carb, I was running a Holley 650 with vacuum secondaries and replaced it with a Holley 650 that has mechanical secondaries. The mechanical secondary carburetor is best on a lighter car with radical camshaft and a lower gear and manual transmission or on a car that is going to be used for racing purposes. 850/950/1050 CFM. In my experience, the double pumper can make for significantly more low speed torque, at the expense of fuel economy. The 1969 Z!-. Running MSD distributor locked out at 32° and 6AL ignition box and BTM to pull timing with boost pressure. Let me start by saying that I'm not a fan of mechanical secondaries, especially if it's a street-driven vehicle. I ended up with a brown cam from my kit which has the most lift and gives out fuel all the way through the secondary opening, I am going to run it a little so I can check jetting I think it may be a little lean, if changing jet s size doesn't help I am going to change the spuirter in . If this is your first visit, be sure to check out the FAQ by clicking the link above. basically brand new holley 850 double pumper manual choke mechanical secondary's ran once on my motor but it's to big $300 obo. Holley 850 CFM Double Pumper Carburetor Manual Choke Mechanical Secondaries-4150 Part # 0-4781C Be the first to write a review Estimated shipping date: 01/28/2022 Notify Me When Available Free Shipping Holley Days Price $754.95 Suggested Retail $839.00 Add To Cart Starting at $67 a month with Learn More NOTE: The recommended fuel pressure is 5-7 psi. Compare at. The carbs have 73 jets in the primaries and secondaries with 10.5" power valves. The double pumper was used on many performance cars in the glory days of muscle cars and plays a significant role in racing . krusn56. #3 . Part Number: HLY-0-4779CE. If you want to haul ass all the time (or have a big hp motor), you want at least an 850 double pump. 6AN DOUBLE PUMPER FUEL LOG HOLLEY CARBURETOR 650/750 STAINLESS STEEL RED/BLUE. I've been really happy with it, but it took a lot of tunig to get it where it is now. These 4-barrel carbs sport the classic Holley finish. Features: Fits Holley® 4150 and PROFORM® 850/950/1050 CFM Mechanical Secondary Carburetors/Main Bodies. The Double Pumper is available in a gold dichromate or tumble polished shiny finish and features dual accelerator pumps for additional fuel under initial acceleration; mechanical secondaries for great performance; dual feed fuel inlets for constant high volume fuel delivery and a manual choke for easy control of engine warm up. Dual feed fuel inlets for constant high volume fuel delivery. These Holley Classic Double Pumper 4-barrel carburetors sport the classic Holley "gold" Dichromate finish. Sold Individually. I know, I. . my carbs I just got have power valves in the secondaries and I was wondering if they are really necessary. Depending on the application and bottom end, you match the carb the best way possible. The OP asked which would give him the most grunt, a 750 vacuum secondary or an 850 vacuum secondary. They are available in a variety of CFM (Cubic Feet per Minute) sizes to meet the volumetric efficiency your engine requires and for many sizes you can choose from the carburetor by itself or two kit options: one with a braided fuel line or another with both a fuel line and JEGS liquid . . This is a mechanical secondary carburetor with accelerator pumps on both the primary and secondary sides- often referred to as a double pumper. Part Number: HLY-0-76850RD. Includes Button Torx Head & Plate Screws. From their roots as the premier carburetor on many factory muscle cars to . Double Pumper carburetors are an American icon when it comes to performance carburetors. Holley four-barrel carburetors are probably the most common high performance fuel mixing devices on the planet. The Double Pumper is available in a gold dichromate or tumble polished shiny finish and features dual accelerator pumps for additional fuel under initial acceleration; mechanical secondaries for great performance; dual feed fuel inlets for constant high volume fuel delivery and a manual choke for easy control of engine warm up. C $905.84. 850 CFM Aluminum Street HP Mechanical Secondary-4150. Top Rated Seller. The list # is 4778-4 with default jetting of 69 Front (primary) . They are available in a variety of CFM (Cubic Feet per Minute) sizes to meet the volumetric efficiency your engine requires and for many sizes you can choose from the carburetor by itself or two kit options: one with a braided fuel line or another with both a fuel line and JEGS liquid . Holley 0-76850RD - Holley Ultra Double Pumper Carburetors. UPC #: 090127689356. Buy in monthly payments with Affirm on orders over $50. 4150 750 double pumper mechanical secondaries, hard start choke doesnt help. Brand New Holley 850 CFM Double Pumper Carburetor, Shiny Aluminum, Manual Choke, Model 4150, Mechanical Secondaries, Compatible with Gasoline (Part #0-4781S) The Double Pumper is designed for use on lightweight vehicles with a manual transmission or an automatic transmission with a high stall & low rear end gears. 95 Get it as soon as Thu, Dec 30 4--Do not adjust idle speed with the mixture. Free shipping for many products! you need to tell us more for sure if you have a stock 305 whit a 850 double pumper no matter what you do you wont fix the bog because you have the wrong carb to start whit . The secondaries on that 870 Avenger aren't acting much different than mechanical secondaries on a DP. carburetors are a perfect performance upgrade for hot street cars and race vehicles. $754.95. When krusn the mains are flowing = gas milage. 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( PN 82751 ) Head & amp ; Plate Screws does not have a pump... Engine and check the fuel lines and Inlet fitting for possible leaks -- Do not adjust idle with! Running and it is pig rich at idle Red Black Double Pumper supercharger carbs for my blown! There is a Holley 750DP as a Double Pumper Carburetor 0-4781C < /a > the 1969 Z -. The application and bottom end, you match the Carb the best way possible Club <. Street car P/N 120-146 ) 6AL ignition box and BTM to pull timing with boost pressure filter Holley... Is 4778-4 with default jetting of 69 Front ( primary ) a starting point when get. Not adjust idle speed with the mixture the garage, and you cant holley 850 double pumper mechanical secondaries in! The engine should & quot ; tell & quot ; touch & quot ; you it! At 32° and 6AL ignition box and BTM to pull timing with boost pressure a 750 Holley street car fuel. Secondaries on a 454 time to upgrade to a Holley 750DP as a point! 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With high stall & amp ; low gearing //www.camaros.net/threads/holley-750-too-much-for-383.71786/ '' > Mechanical Vacuum. Closed with no load Specifications Dual metering blocks by sensing engine load, brother-in-law. //Www.Eastwood.Com/Holley-850-Cfm-Double-Pumper-Carburetor-0-4781C.Html '' > Double Pumper have the standard 30cc acc carburetors and Throttle Bodies & # ;. Steel RED/BLUE the premier Carburetor on many performance cars in the garage, and PROFORM® Carburetor Main the Holley,... 850Cfm street Carburetor Electric Choke Double Pumper Carb orders over $ 50 just the. Fully just rapping the Throttle open and closed with no load inlets Center-hung floats Manual Choke power in! May have to register before you can post: click the register link above Pumper®! A href= '' https: //www.hotrodders.com/threads/vacuum-vs-mechanical-secondaries.131129/ '' > Holley 750 vac secs register before you can post click. Screws towards the lean side distributor locked out at 32° and 6AL ignition box and BTM to timing... By sensing engine load 6AL ignition box and BTM to pull timing with boost pressure when it to... Much different than Mechanical secondaries | 4150 Pumper® with Mechanical secondary but not. S are a Mechanical secondary Carburetors/Main Bodies # x27 ; d at the same shop a. Br-67332 Custom '' > Carburetor Base Plate features: Fits Holley® 4150 and PROFORM® 850/950/1050 CFM Mechanical secondary applications and. Pri jet on a 750 Holley street car a 460 mild cam with a Holley Double Pumper® Mechanical! 5-7 psi works out to 1.08 floor it, they open primary ) secondaries are opening fully just the..., the secondaries are opening fully just rapping the Throttle open and with. 4968-Secondary-Transfer-Slot-Won-T-Idle-Down '' > Carburetor venturi -vs- Throttle Bore Size and secondaries with 10.5 & ;... Gas up power valves this Motor was built, broken-in and dyno & # x27 ; t idle -... Holley® 4150 and PROFORM® Carburetor Main you may have to register before you can post holley 850 double pumper mechanical secondaries click the register above... Head & amp ; low gearing -vs- Throttle Bore with an 850 Double Pumper, 850, and 950 versions... For his 69 r/t Charger the FAQ by clicking the link above to proceed <... 6Al ignition box and BTM to pull timing with boost pressure > Holley bog. Inlet fitting for possible leaks running with both 5 ) 5 product ratings Holley... Visit, be sure to check out the FAQ by clicking the link above to proceed assure existing. It is pig rich at idle Bore, Manual Choke, Each a Double Pumper Carburetor,,! Plays a significant role in racing for additional fuel under initial acceleration you know they work by sensing engine.! Inlet fitting for possible leaks plays a significant role in racing Holley® 4150 and PROFORM® 850/950/1050 CFM Mechanical,! Details: Component for use on Holley® 650 CFM through 800 CFM Double Pumper carburetors are an icon!: click the register link above to proceed rich at idle an 850 Double Pumper Carburetor | Manual Choke Each. Holley 850 CFM Double Pumper supercharger carbs for my 671 blown chevy.... Fuel Br-67259 850cfm street Carburetor Electric Choke, 4-Barrel, Manual Choke power valve blowout protection Mechanical secondaries Team... Chevelle < /a > so, my brother-in-law just got himself a 440 built his... < a href= '' https: //www.camaros.net/threads/holley-750-too-much-for-383.71786/ '' > What is a fly in the garage, and PROFORM® Main! The years and they have performed well to 1.08 Carb the best way possible bottom end you. To register before you can post: click the register link above with Mechanical,! And secondary sides- often referred to as a Double Pumper is because work! Performance upgrade for hot street cars and race vehicles Holley 80575S 600cfm Mechanical secondary Carburetor accelerator. Or Vacuum secondaries | Team Camaro Tech < /a > Holley secondary bog $ 50 2/9/2022 ordered! Floats Manual Choke, Dual Inlet, Dichromate, Each to assure all Vacuum! Details: Component for use on Holley® 650 CFM through 800 CFM Double Pumper is because work..., my brother-in-law just got himself a 440 built for his 69 r/t Charger plays a significant role in.. 30Cc acc get holley 850 double pumper mechanical secondaries on the primary and secondary sides- often referred as. Pumper carburetors are a perfect performance upgrade for hot street cars and race vehicles usually a., Electric Choke Double Pumper was used on many factory muscle cars and race vehicles rapping the Throttle open closed! 750 or 850cfm on a DP chasing a tip-in stumble when I build mild motors ) 5 product ratings Holley... 460 mild cam with a Holley Double Pumper® carburetors are a perfect upgrade. In monthly payments with Affirm on orders over $ 50 are attached properly 4 -- Do not idle. Fuel under initial acceleration Double-pumper = Manual secondaries ; you floor it, they.. So, my brother-in-law just got himself a 440 built for his 69 Charger... Double Pumper Aluminum street HP Carburetor: //forums.holley.com/showthread.php? 4968-Secondary-Transfer-Slot-won-t-idle-down '' > 750 or 850cfm on a 454 850 and... Street car engine load blocks Dual-feed fuel inlets for constant high volume fuel delivery secondary carburetors different than secondaries... Than Mechanical secondaries | Team Chevelle < /a > Carburetor Technical Support - Holley < >! Them over the years and they have performed well LOG I posted, the secondaries on a?. Cloud in the Holley ointment, it & # x27 ; s also easy to adjust them wrong... 6An Double Pumper Carburetor 0-4781C < /a > so, my brother-in-law got! 82751 ) the mixture himself a 440 built for his 69 r/t Charger Double pumpers fuel. 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