The Edelbrock E-Force 122 Supercharger Kit part # 1552 for 302-400 c.i.d. Small-Block Chevrolets with Vortec cylinder heads is a positive displacement supercharger that is capable of producing 500+ horsepower on a small-block Chevy engine. This system utilizes the Eaton H122 rotor assembly for maximum efficiency in a compact package. The compact design may potentially fit under the hood of most muscle car and street rod applications. Testing resulted in a peak of 507 horsepower and 487 ft/lbs. of torque @ 5 psi on a 350 c.i.d. with 9.5:1 compression. The E-Force 122 is designed for use with factory style belt and pulley configurations. Will not work with aftermarket serpentine pulley systems and will require the use of a long-style water pump. Each kit includes the supercharger assembly with Eaton internals, intake manifold, drive pulleys, belt, gaskets and all necessary items for ease of installation. Does not include carburetor, so you can use your carburetor of choice This Edelbrock E-Force Supercharger is intended for 302-400 c.i.d. Vortec Small-Block Chevrolets equipped with long water pumps and stock style bracketry. It's designed to utilize the factory accessory drive belts, in conjunction with the secondary 6-rib supercharger pulley drive system.