6112-4094 421 Pontiac Early and Late FX Series -7cc Flat Top Pontiac Early and Late Forged Piston Set 4.094 inch bore Pin Dia.: 0.98" Comp Height: 1.585"421 Pontiac Early and Late, FX, Comp Height: 1. 585, 7cc Flat Top , PIN: . 98", Full Floating or Press Fit, Ring Groove: 1. 2 1. 2 3MM, Stroke: 4. 000", ROD: 6. 625, Approx Comp Ratio: 62cc 12. 1, 87cc 9. 41, 124cc 7. 18 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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6112-4094 421 Pontiac Early and Late FX Series -7cc Flat Top Pontiac Early and Late Forged Piston Set 4.094 inch bore Pin Dia.: 0.98" Comp Height: 1.585"