6125-4120 455 Pontiac Late FX Series -18cc Dish Top Pontiac Late Forged Piston Set 4.120 inch bore Pin Dia.: 0.98" Comp Height: 1.48" Small Block Chevy 434 Chevy LS

434 Chevy LS

Approx Comp Ratio: 65cc-9

405 Chevy LS

460 Pontiac Late

469 FE Ford

6125-4120 455 Pontiac Late FX Series -18cc Dish Top Pontiac Late Forged Piston Set 4.120 inch bore Pin Dia.: 0.98" Comp Height: 1.48" Small Block Chevy 434 Chevy LS449 Pontiac Late , FX, Comp Height: 1. 48, 18cc Dish 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 11. 37, 87cc 9. 09, 124cc 7. 1 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.