6020-4155 425 Big Block Oldsmobile FX Series -12cc Flat Top Oldsmobile Forged Piston Set 4.155 inch bore Pin Dia.: 0.98" Comp Height: 1.625"
$669.95
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431 Big Block Oldsmobile, FX, Comp Height: 1.625, -12cc Flat Top , PIN: .98", Full-Floating or Press Fit, Ring Groove: 1/16-1/16-3/16" , Stroke: 3.975", ROD: 7, Approx Comp Ratio: 72cc-10.5, 75cc-10.21, 77cc-10.02
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