Big Block Chevy Crankshaft Pulley, 396 427 454 V-Belt - Long Water Pump Chevy Big Block Crankshaf Pulley - LWP, V-belt (396-427-454) Made in the USA from 6061-T6 Billet Aluminum Designed for engines with Long Water Pump 2 Grooves, 5.4" Diameter, 3.0" Overall Length 3 Bolt Pattern