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These carburetors that are intended for use with superchargers, and have a unique capability that allows their power valves to reference the intake manifold vacuum below the supercharger. This allows the power valve to operate as it should, based off intake manifold vacuum. A power valve provides further enrichment to the main metering system under load (low vacuum) conditions. Without this external referencing, the power valve would be "reading" the supercharger boost pressure, which has no bearing on the engine load.
Holley HP(TM) Carburetors have been the standard in racing carburetors for nearly two decades. So how do you make them better? You make them 38% lighter, increase the fuel capacity by 20% and add 30 other new features! They're available in an all-new Hard Core Gray(TM) hard coat anodized finish with Black(TM) billet for superior corrosion protection.
Holley's HP Series methanol carburetors set the standard inoval track racecarbs. These performance calibratedalcohol carbs arerace ready, right out of the box. The Model 4150 HP carb is packed with premium features like contoured air entries, high strength castings, and stainless throttle plates, all of whichwill provide you with a definite advantage at the track.
These Holley Model 4160 750 CFM carburetors feature all metal parts and vacuum secondaries.They have a universal throttle lever and power valve blow-out protection.
Holley's HP Series carburetors set the standard inoval track racecarbs. These performance calibratedgasoline carbs arerace ready, right out of the box. The Model 4150 HP carb is packed with premium features like contoured air entries, high strength castings, and stainless throttle plates, all of whichwill provide you with a definite advantage at the track.
Top off your your engine with an American icon - the Holley Model 4150 Double Pumper. As a staple on hot street cars and race vehicles, this carburetors dual accelerator pumps provide additional fuel under initial acceleration for awesome tire-turning performance in lighweight vehicles and vehicles with manual transmissions orlow gearing. Plus, with mechanical secondaries, your foot directly controls the opening of the secondary throttle blades.
The new Ultra Double Pumper Carburetors have an enhanced fuel curve for optimum performance, with many more features such as aluminum construction; Hard Core Gray(TM) finish w/ black anodized billet aluminum metering blocks and base plate; 4 corner idle for precise idle control; mechanical secondaries for great performance; clear fuel level sight plugs for easy, no mess fuel level adjustments; Ford automatic transmission kickdown for use on popular Ford transmissions; four vacuum ports for all necessary vacuum accessories; and for the first time on a Double Pumper, factory pre-set electric ...
This direct replacement main body will turn your ho-hum Holley street carburetor into a true racing carb featuring adjustable screw-in air bleeds and performance down-leg boosters. Plus, airflow is improved by eliminating the air horn and choke assembly, which can translate into 25-50 more horsepower! Flows 750+ CFM.
The Willy's carbs feature Holley 750 CFM main bodies, special radius air entry, externally adjustable metering blocks, screw-in air bleeds, black powder coating and Teflon throttle shaft bushings. 355-406 ci.
Rebuild kit for Holley Model 4160 390 CFM carburetor.
Holley's new Model 4160 600 CFM four barrel aluminum street carburetor is constructed from aluminum, which compared to its zinc counterpart equates to a weight savings of over 5 lbs. The new aluminum will hold its shine and can also be hand polished for a custom look.
Phenolic material is a type of plastic resin which has excellent insulating properties, so it will keep the fuel in your Holley 4150/4160 cooler for more power. For 390 CFM carbs with 1.467" diameter bores.