GM Big Block V8 Engine; 7.4L/ 454 Cubic Inch; Automotive; 460 Horsepower/ 479 Foot Pounds of Torque; Cast Iron Block/ Aluminum Cylinder Heads; 9.85:1 Compression Ratio; 4.25 Inch Bore/ 4 Inch Stroke; Externally Balanced; With Cylinder Heads/ Steel Crankshaft/ Hypereutectic Pistons/ Hydraulic Roller Camshaft/ 4 Bolt Main Block/ 1 Piece Rear Main Seal/ 6.135 Inch OEM Type Connecting Rods With 150,000 PSI Bolts/ Oil Pan/ Timing Cover/ Valve Covers/ Harmonic Balancer