Chev 502 ZZ502 / 502 HP Deluxe Crate Engine GM Performance # 12496962 19331579Crate Engine, Oval Port, 9. 6: 1, 4 Bolt Mains, Chevy ZZ502, 508 hp, 580 ft. lbs. of Torque, with Flexplate, Big Block, 8. 2L, Chevy, Each Crate Engine Family: Chevy Big Block Actual Engine Displacement: 8. 2L 502 Crate Engine Cylinder Head Material: Aluminum Engine Block Material: Cast iron Advertised Compression Ratio: 9. 6: 1 Assembled: Yes Engine Balance: External Cam Style: Hydraulic roller tappet Rear Main Seal Style: 1 piece Intake Manifold