6120-4180 455 Pontiac Late FX Series -7cc Flat Top Pontiac Late Forged Piston Set 4.180 inch bore Pin Dia.: 0.98" Comp Height: 1.48"462 Pontiac Late , FX, Comp Height: 1. 48, 7cc Flat Top , PIN: . 98", Full Floating or Press Fit, Ring Groove: 1. 2 1. 2 3MM, Stroke: 4. 210", ROD: 6. 625, Approx Comp Ratio: 62cc 13. 13, 87cc 10. 2, 124cc 7. 76 Effective June 15th 2026, These Pontiac 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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6120-4180 455 Pontiac Late FX Series -7cc Flat Top Pontiac Late Forged Piston Set 4.180 inch bore Pin Dia.: 0.98" Comp Height: 1.48"