6000-4185 455 Big Block Oldsmobile FX Series -12cc Flat Top Oldsmobile Forged Piston Set 4.185 inch bore Pin Dia.: 0.98" Comp Height: 1.75"468 Big Block Oldsmobile, FX, Comp Height: 1. 75, 12cc Flat Top , PIN: . 98", Full Floating or Press Fit, Ring Groove: 1. 2 1. 2 3MM, Stroke: 4. 250", ROD: 6. 735, Approx Comp Ratio: 72cc 11. 3, 75cc 10. 98, 77cc 10. 78 Effective June 15th 2026, These Oldsmobile ring grooves have been updated to the new specifications of 1. 2 1. 2 3mm. Parts manufactured prior to this date feature ring grooves with dimensions of 1 16 1 16 3 16.
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6000-4185 455 Big Block Oldsmobile FX Series -12cc Flat Top Oldsmobile Forged Piston Set 4.185 inch bore Pin Dia.: 0.98" Comp Height: 1.75"