Chevrolet Performance ZZ632/1000hp Deluxe Long Crate Engine # 19432060Crate Engine, Long Block, ZZ632, Tall Deck, 4 Bolt Mains, Cast Iron Block, Aluminum Heads, 12. 0: 1 Compression, 4500 Flange, Big Block, Chevy, Each Crate Engine Family: Chevy Big Block Actual Engine Displacement: 10. 3L 632 Crate Engine Cylinder Head Material: Aluminum Engine Block Material: Cast iron Advertised Compression Ratio: 12. 0: 1 Assembled: Yes Engine Balance: Internal Cam Style: Hydraulic roller, OE roller Rear Main Seal Style: 1 piece