6120-4125 455 Pontiac Late FX Series -7cc Flat Top Pontiac Late Forged Piston Set 4.125 inch bore Pin Dia.: 0.98" Comp Height: 1.48" Piston Series Option:FX-3 2618 Alloy with Lateral Gas Ports - XR .225 Wall Pin Upgrade - Spiro Locs 414 Gen 5 LT Direct

414 Gen 5 LT Direct Injection

487 Pontiac Late

-12cc Flat Top

943 pin pistons

6120-4125 455 Pontiac Late FX Series -7cc Flat Top Pontiac Late Forged Piston Set 4.125 inch bore Pin Dia.: 0.98" Comp Height: 1.48" Piston Series Option:FX-3 2618 Alloy with Lateral Gas Ports - XR .225 Wall Pin Upgrade - Spiro Locs 414 Gen 5 LT Direct450 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 12. 87, 87cc 9. 97, 124cc 7. 59 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.