6010-4185 481 Stroker Big Block Oldsmobile FX Series -12cc Flat Top Oldsmobile Forged Piston Set 4.185 inch bore Pin Dia.: 0.99" Comp Height: 1.26"495 Big Block Oldsmobile, FX, Comp Height: 1. 26, 12cc Flat Top , PIN: . 99", Full Floating or Press Fit, Ring Groove: 1. 2 1. 2 3MM, Stroke: 4. 500", ROD: 7. 1, Approx Comp Ratio: 72cc 11. 89, 75cc 11. 56, 77cc 11. 35 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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6010-4185 481 Stroker Big Block Oldsmobile FX Series -12cc Flat Top Oldsmobile Forged Piston Set 4.185 inch bore Pin Dia.: 0.99" Comp Height: 1.26"