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Ready-to-race. Ideal for track racing. Engine newly revised. World Products Merlin Big Block. 4.31" Bore Wiseco Custom Pistons light Dome 11:1. 3.766 Stroke: K1 Technologies 4340 forged Crank int. balanced. 4-bolt, Custom Victor jr 107 cc alloy-head. 520 HP. Munchie M22.