6100-4120 389 Pontiac Late FX Series -7cc Flat Top Pontiac Late Forged Piston Set 4.120 inch bore Pin Dia.: 0.98" Comp Height: 1.71" Bore Size 3635 in 92256 mm 408 Small Block Ford 351W

408 Small Block Ford 351W

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6100-4120 389 Pontiac Late FX Series -7cc Flat Top Pontiac Late Forged Piston Set 4.120 inch bore Pin Dia.: 0.98" Comp Height: 1.71" Bore Size 3635 in 92256 mm 408 Small Block Ford 351W400 Pontiac Late , FX, Comp Height: 1. 71, 7cc Flat Top , PIN: . 98", Full Floating or Press Fit, Ring Groove: 1. 2 1. 2 3MM, Stroke: 3. 750", ROD: 6. 625, Approx Comp Ratio: 62cc 11. 55, 87cc 8. 97, 124cc 6. 86 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.