BluePrint Engines Chev 383 Marine Based Dressed Engine 405hp # MBP3830CTCGM MARINE SB COMPATIBLE 383 C. I. ENGINE 405 HP BASE DRESSED CARBURETED DESCRIPTION: HP & Torque: 405 HP 450 FT LBS Compression Ratio: 9. 5: 1 Cast Iron Heads Hydraulic Roller Cam Cast Steel Crank Hypereutectic Pistons BLOCK: New BluePrint cast iron block Square and parallel decked Align honed main bearing bore Cylinders honed on computer controlled machine to within . 0002 straightness and roundness Cylinders are sonic tested for thickness 4 Bolt