1996 To 2000 Vortec Truck And SUV GM Small Block V8 Engine; 6.3L/ 383 Cubic Inch; Automotive; Increases 47 Rear Wheel Horsepower/ 55 Foot Pounds of Torque At 4400 RPM; Cast Iron Block/ Aluminum Cylinder Heads; 10:1 Compression Ratio; 3.75 Inch Stroke; Externally Balanced; 49 State Legal; With Cylinder Heads/ Forged Steel Crankshaft/ Hypereutectic Pistons/ Hydraulic Roller Camshaft/ 4 Bolt Main Block/ 1 Piece Rear Main Seal/ 5.7 Inch OEM Type Connecting Rods With 150000 PSI Bolts/ Oil Pan/ Timing Cover/ Valve Covers/ Fuel Injector/ Harmonic Balancer