6130-4160 455 - 4.250 Stroke Pontiac Late FX Series -7cc Flat Top Pontiac Late Forged Piston Set 4.160 inch bore Pin Dia.: 0.99" Comp Height: 1.285" Bore Size 3935 in 99870 mm 454 Big Block Oldsmobile

454 Big Block Oldsmobile

Approx Comp Ratio: 44cc-8

387 Gen 5 LT Direct Injection

428 Chevy LS

When you order this option with a new set of LS

6130-4160 455 - 4.250 Stroke Pontiac Late FX Series -7cc Flat Top Pontiac Late Forged Piston Set 4.160 inch bore Pin Dia.: 0.99" Comp Height: 1.285" Bore Size 3935 in 99870 mm 454 Big Block Oldsmobile462 Pontiac Late , FX, Comp Height: 1. 285, 7cc Flat Top , PIN: . 99", Full Floating or Press Fit, Ring Groove: 1. 2 1. 2 3MM, Stroke: 4. 250", ROD: 6. 8, Approx Comp Ratio: 62cc 13. 16, 87cc 10. 2, 124cc 7. 76 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.