Chevrolet Performance 19331581: 19331581 Chevy Tall Deck ZZ572/620 Base 572 ci. Big Block Crate Engine [621 HP/645 TQ]
ZZ572/620 Base Crate Engine Gen VI Tall Deck Big Block Chevy 621 HP @ 5400 RPM 645 ft.lbs. Torque @ 4200 RPM Cast Iron Block w/4-Bolt Mains (4.560 in. Bore) Aluminum Rectangular Port Heads Forged Steel Crank Hydraulic Roller Cam