Race Pistons 427ci Open Chamber Head Race Pistons Piston Dia.:4.280" Piston Top: 16.8CC Dome Press Fit Pin Comp Ratio:9.98:1 w/100.9cc Heads, 8.73:1 w/116.9cc Heads Ring Grooves: 5/64", 5/64", 3/16" Set of 8
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