Affordable race carburetors assembled by hand in the USA with these quality components:Main BodyZincHigh-flow designCenter-hung floatsChangeable screw-in air bleedsHigh-performance down leg boosters (except 650 cfm w/straight)Maximum airflow and dyno-proven horsepower and torque gainsMetering BlocksBillet aluminumNo warping or porosity problemsChangeable idle feed restrictorsThrottle BaseplateBillet aluminumAdjustable secondary airflow cam bracketTorx throttle plate screwsPower valve blowout protectionWelded throttle shaftSlip link linkage on mechanical secondary modelsTimed and full vacuum tubes for accessories and tuningFuel BowlsDie-cast aluminumFuel level sight glass windowNotched secondary floatsSecondary jet extensions