6020-4040 400 Small Block Oldsmobile FX Series -12cc Flat Top Oldsmobile Forged Piston Set 4.040 inch bore Pin Dia.: 0.98" Comp Height: 1.625"408 Small Block Oldsmobile, FX, Comp Height: 1. 625, 12cc Flat Top , PIN: . 98", Full Floating or Press Fit, Ring Groove: 1. 2 1. 2 3MM, Stroke: 3. 975", ROD: 7, Approx Comp Ratio: 64cc 10. 9, 68cc 10. 46, 70cc 10. 24 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.
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6020-4040 400 Small Block Oldsmobile FX Series -12cc Flat Top Oldsmobile Forged Piston Set 4.040 inch bore Pin Dia.: 0.98" Comp Height: 1.625"