6100-4160 400 Pontiac Late FX Series -7cc Flat Top Pontiac Late Forged Piston Set 4.160 inch bore Pin Dia.: 0.98" Comp Height: 1.71" Stroke 3.622" 12 Effective June 15th 2026

12 Effective June 15th 2026

Approx Comp Ratio: 72cc-9

311 Small Block Ford 302

-4cc Dish Top

436 Gen 5 LT Direct Injection

6100-4160 400 Pontiac Late FX Series -7cc Flat Top Pontiac Late Forged Piston Set 4.160 inch bore Pin Dia.: 0.98" Comp Height: 1.71" Stroke 3.622" 12 Effective June 15th 2026408 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. 74, 87cc 9. 12, 124cc 6. 97 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.