6010-4155 481 Stroker Big Block Oldsmobile FX Series -12cc Flat Top Oldsmobile Forged Piston Set 4.155 inch bore Pin Dia.: 0.99" Comp Height: 1.26" Piston Ring Kit Option:Pistons - Pins - Locs With DSS Racing Rings in a Kit 440 Small Block Chevy

440 Small Block Chevy

436 Gen 5 LT Direct Injection

480 Pontiac Late

Most will require special order

324 Ford Coyote

6010-4155 481 Stroker Big Block Oldsmobile FX Series -12cc Flat Top Oldsmobile Forged Piston Set 4.155 inch bore Pin Dia.: 0.99" Comp Height: 1.26" Piston Ring Kit Option:Pistons - Pins - Locs With DSS Racing Rings in a Kit 440 Small Block Chevy488 Big Block Oldsmobile, FX, Comp Height: 1. 26, 12cc Flat Top , PIN: . 99", Full Floating or Press Fit, Ring Groove: 1. 2 1. 2 3MM, Stroke: 4. 500", ROD: 7. 1, Approx Comp Ratio: 72cc 11. 76, 75cc 11. 43, 77cc 11. 22 Effective June 15th 2026, These Oldsmobile 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.