{"product_id":"holley-double-pumper-carburetor-0-4781s","title":"Holley Double Pumper Carburetor - 0-4781S","description":"Holley Double Pumper® carburetors are a perfect performance upgrade for hot street cars and race vehicles. Double Pumper carburetors are an American icon when it comes to performance carburetors. 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 street or the quarter mile.\n\nThe Double Pumper is designed for use on lightweight vehicles with a manual transmission or an automatic transmission with a high stall and low rear end gears. 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.\n\nDon't trust your performance to just anyone, Holley is the only modular carburetor company that has been in business for over 100 years and has powered every NASCAR champion since the 60's.\n\u003ch3\u003eFeatures:\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eShiny finish for good looks\u003c\/li\u003e\n\u003cli\u003eOptimized street\/strip calibration that works out-of-the-box\u003c\/li\u003e\n\u003cli\u003eManual choke (Cable driven, hand operated) for precise cold start control\u003c\/li\u003e\n\u003cli\u003eMechanical secondaries for awesome tire turning performance\u003c\/li\u003e\n\u003cli\u003e4 corner idle allows you to precisely control your idle system\u003c\/li\u003e\n\u003cli\u003eDual accelerator pumps for additional fuel under initial acceleration\u003c\/li\u003e\n\u003cli\u003eDual feed fuel inlets for constant high volume fuel delivery\u003c\/li\u003e\n\u003cli\u003eIntended for lightweight vehicles w\/ manual trans or automatics with high stall \u0026amp; low gearing\u003c\/li\u003e\n\u003cli\u003e100% wet-flow tested by Holley technicians to assure it arrives ready to run!\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eProduct Specifications:\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Details:\u003c\/strong\u003e 850 CFM - 4150 - Mechanical Secondaries - Shiny - Gasoline\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAdjustable Air Bleeds:\u003c\/strong\u003e No\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAdjustable Emulsion Bleeds:\u003c\/strong\u003e No\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAdjustable Idle Feed Restrictors:\u003c\/strong\u003e No\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAir Cleaner Flange Diameter:\u003c\/strong\u003e 5-1\/8\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBarrel Quantity:\u003c\/strong\u003e 4\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBarrels:\u003c\/strong\u003e 4\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBarrels Quantity:\u003c\/strong\u003e 4\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBody Color:\u003c\/strong\u003e Polished\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBody Finish:\u003c\/strong\u003e Polished\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBody Material:\u003c\/strong\u003e Aluminum\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBooster:\u003c\/strong\u003e Downleg\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBooster Design:\u003c\/strong\u003e Downleg\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCarburetor Material:\u003c\/strong\u003e Aluminum\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCarburetor Use:\u003c\/strong\u003e Performance and Race\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCFM:\u003c\/strong\u003e 850\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCFM Rating:\u003c\/strong\u003e 850\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eChoke:\u003c\/strong\u003e Manual\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eChoke Type:\u003c\/strong\u003e Manual\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCircuit Count:\u003c\/strong\u003e 2\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e Polished Aluminum\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCondition:\u003c\/strong\u003e New\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCubic Feet Per Minute Rating:\u003c\/strong\u003e 850\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFinish:\u003c\/strong\u003e Polished\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlange Shape:\u003c\/strong\u003e Square\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlange Type:\u003c\/strong\u003e Square\/4150\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFloat Level:\u003c\/strong\u003e Externally Adjustable\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFuel:\u003c\/strong\u003e Gasoline\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFuel Inlet:\u003c\/strong\u003e Dual\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFuel Inlet Center to Center:\u003c\/strong\u003e 9.5\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFuel Inlet Count:\u003c\/strong\u003e Dual\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFuel Inlet Type:\u003c\/strong\u003e 5\/8-18 Inverted Flare\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFuel Type:\u003c\/strong\u003e Gasoline\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGasket Or Seal Included:\u003c\/strong\u003e Yes\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGrade Type:\u003c\/strong\u003e Street\/Strip\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLinkage Attached:\u003c\/strong\u003e Yes\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMarine Approved:\u003c\/strong\u003e No\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMarine Use:\u003c\/strong\u003e No\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Aluminum\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMeter Block Material:\u003c\/strong\u003e Cast Aluminum\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMetering Block Color:\u003c\/strong\u003e Shiny\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eModel:\u003c\/strong\u003e 4150\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMounting Hardware Included:\u003c\/strong\u003e No\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMounting Hole Quantity:\u003c\/strong\u003e 4\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Type:\u003c\/strong\u003e Carburetor\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrimary Float Type:\u003c\/strong\u003e Center Hung Nitrophyl\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrimary Jet Diameter:\u003c\/strong\u003e 80\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrimary Main Jet Size:\u003c\/strong\u003e 80\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrimary Power Valve:\u003c\/strong\u003e 6.5\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrimary Pump Nozzle Size:\u003c\/strong\u003e 31\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrimary Throttle Bore Diameter:\u003c\/strong\u003e 1.75\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrimary Venturii Diameter:\u003c\/strong\u003e 1.563\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Carburetor\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSecondaries:\u003c\/strong\u003e Mechanical\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSecondary Barrel Type:\u003c\/strong\u003e Mechanical\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSecondary Float Type:\u003c\/strong\u003e Center Hung Nitrophyl\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSecondary Jet Extensions:\u003c\/strong\u003e No\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSecondary Main Jet Size:\u003c\/strong\u003e 80\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSecondary Pump Nozzle Size:\u003c\/strong\u003e 31\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSecondary Throttle Bore Diameter:\u003c\/strong\u003e 1.750\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeries:\u003c\/strong\u003e Double Pumper\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpacer Included:\u003c\/strong\u003e No\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSupercharged Application:\u003c\/strong\u003e No\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThrottle Bore Diameter:\u003c\/strong\u003e 1.750 inch\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThrottle Kickdown Provision(S):\u003c\/strong\u003e Compatible with GM, Chrysler, and Ford A\/T kickdown linkage\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVacuum Ports:\u003c\/strong\u003e 1 timed (spark) port, 1 full, and 1 PCV port\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eInstallation Notes:\u003c\/h3\u003e\n\u003cp\u003eThis model of carburetor has the square bore flange bolt pattern. It can replace Holley, Edelbrock, Carter AFB, and Autolite style carburetors with 5 3\/16\" x 5 5\/8\" bolt pattern. If you have a spreadbore style intake manifold, you will need an adapter to install this carburetor. Similar to the Mr. Gasket #1932.\u003c\/p\u003e","brand":"Holley","offers":[{"title":"Default Title","offer_id":49709895811310,"sku":"HLY-0-4781S","price":799.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0819\/9110\/6798\/files\/2d7c46599ffcc8732bf63e5aca212f87a735e2aa_49d8be0a-88f0-419d-94da-7e55d60d475e.jpg?v=1791512238","url":"https:\/\/elmosspeedshop.com\/products\/holley-double-pumper-carburetor-0-4781s","provider":"Elmo's Speed Shop","version":"1.0","type":"link"}