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FAST 307602 FOUR BARRELL THROTTLE BODY for Holley 4500 Pattern 

For greater airflow and throttle response !

Precision-machined to incorporate a tapered, high-flow throttle bore, the new FAST™ Four-Barrel Throttle Bodies offer improved performance through increased airflow rate. Bored and machined from 6061-T6 billet aluminum for consistent quality, excellent appearance and light weight, the FAST™ Four-Barrel Throttle Bodies deliver smooth throttle operation throughout the engine’s entire rpm range. The FAST™ 4500-series throttle body retains the billet aluminum exterior coloration and comes equipped with a Throttle Position Sensor (TPS). The all-new 4150-series throttle body is red anodized and features a TPS and Idle Air Control Motor (IAC) as part of the package.

Designed and engineered to exact tolerances, the FAST™ Four-Barrel Throttle Bodies utilize brass throttle blades to control vibration and reduce thermal expansion. The FAST™ Four-Barrel Throttle Bodies feature inward opening blades that eliminate part throttle directional influence to airflow. Both FAST™ throttle bodies were designed so that all critical dimensions such as height, bore spacing and linkage attachment are identical to 4150 and 4500-style carburetors. This makes carburetor replacement even easier since modification of other parts of your engine such as air pans, throttle linkage or throttle stops is not required.