6130-4150 455 - 4.250 Stroke Pontiac Late FX Series -7cc Flat Top Pontiac Late Forged Piston Set 4.150 inch bore Pin Dia.: 0.99" Comp Height: 1.285"460 Pontiac Late , FX, Comp Height: 1. 285, 7cc Flat Top , PIN: . 99", Full Floating or Press Fit, Ring Groove: 1. 2 1. 2 3MM, Stroke: 4. 250", ROD: 6. 8, Approx Comp Ratio: 62cc 13. 11, 87cc 10. 16, 124cc 7. 74 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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6130-4150 455 - 4.250 Stroke Pontiac Late FX Series -7cc Flat Top Pontiac Late Forged Piston Set 4.150 inch bore Pin Dia.: 0.99" Comp Height: 1.285"