6104-4100 400 Pontiac Early and Late FX Series -14cc Dish Top Pontiac Early and Late Forged Piston Set 4.100 inch bore Pin Dia.: 0.98" Comp Height: 1.71" Piston Ring Kit Option:Pistons - Pins - Locs With DSS Racing Rings in a Kit 421 Chevy LS

421 Chevy LS

340 Small Block Chevy

326 Ford Coyote

354 Pontiac Early and Late

6104-4100 400 Pontiac Early and Late FX Series -14cc Dish Top Pontiac Early and Late Forged Piston Set 4.100 inch bore Pin Dia.: 0.98" Comp Height: 1.71" Piston Ring Kit Option:Pistons - Pins - Locs With DSS Racing Rings in a Kit 421 Chevy LS396 Pontiac Early and Late, FX, Comp Height: 1. 71, 14cc Dish 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 10. 57, 87cc 8. 4, 124cc 6. 53 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.