For Chevy Big Blook Aluminum Crank Pulley, Long and Triple Groove. For Chevy Big Blook Aluminum Crank Pulley, Long and Triple Groove.

Description:
Fits All Bb Chevy Engines When Using A Long Water Pump Fits Bb Chevy 396 427 454 472 502 Using A Long Water PumpPulley Diameter Is 7 3/4" On The Outer Groove & 6 3/4" On The Two Inner GroovesPulley Is 3 1/8" TallBolt Pattern Is 2 3/4" Center Hole Is 2 1/8"Machined From Billet AluminumThese Feature Deep Grooves To Prevent Belts From Slipping