For 1994-97 Chevy/Pontiac LT1 and LT4 Engines
The Edelbrock twin throttle bodies for 1994-97 GM LT1/LT4 engines are designed for maximum power gains with aftermarket components in Camaros, Firebirds and Corvettes. The twin 52mm throttle body is the first choice for stock or mildly modified engines and the twin 58mm is for more radical engine combinations requiring port matching of the manifold to fit in most cases.

For 1997-02 Chevy/Pontiac LS1 and LS2 Engines
The Edelbrock 80mm GM LS series throttle bodies are designed to fit the factory plenum with no modifications. They are cast from aluminum, fully machined, and assembled by Edelbrock using all new components including a pre-set TPS and an idle air bypass solenoid. Extra idle control is provided with the addition of an idle bleed screw.

and 50-State Street Legal!