Billet Aluminum Pulley Kit for Corvette engines. Corvettes have special pulleys and offsets!! These pulleys are hard to find and will allow you to keep your original Corvette water pump and brackets. Billet Aluminum Underdrive Pulleys for small block Corvette engines. Made in the USA on CNC lathes at ultra high speeds for an amazing surface finish and a nearly perfectly balanced pulley. Application 1) Corvette Engines 1971-1982 2) You must have the original Corvette water pump and brackets Pulley Kit Contents: Water Pump Pulley P/N CORV2WP Grooves: 2 Pulley Diameter: 6.2" Pilot Diameter: 0.750" Overall Length: 3.1" Crankshaft Pulley P/N CORV3CR Grooves: 3 Pulley Diameter: 5.6" Bolt Pattern: 3 Bolt Overall Length: 2.1" Alternator Pulley P/N SBC1ALT Diameter: 2.7" Grooves: 1