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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 four barrel carburetors dual accelerator pumps provide additional fuel under initial acceleration for awesome tire-turning performance in lighweight vehicles and vehicles with manual transmissions or low gearing! Check out our selection of Holley 4150 Double Pumper 4-Barrel Carburetors at Speedway Motors!