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 Approx Comp Ratio: 58cc-10

Approx Comp Ratio: 58cc-10

415 Gen 5 LT Direct Injection

Please indicate your final cylinder bore size in the notes section of the shopping cart check out

408 Small Block Ford 351W

73 NOTE: Most FE‑series OEM connecting rods require narrowing at the pin end to achieve proper side clearance within the 2

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 Approx Comp Ratio: 58cc-10400 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.