Billet Aluminum Pulley Kit for Short Water Pump (SWP) engines. Will fit Chevy 396-427-454 engines. Designed for use with stock power steering bracket and alternator bracket. Note: Long water pump Chevy engines are 5.75" from face of water pump pulley to block. Pulley Kit Contents: Water Pump Pulley BBCS1WP Grooves: 1 Diameter: 6.2" Overall Length: 2.85" Crankshaft Pulley BBCS1CR Grooves: 1 Diameter: 5.4" Overall Length: 0.7" Bolt Pattern: 3 Bolt BBC1ALT 1 Groove Alternator Pulley and Cap Diameter: 2.7"