6300-4040 340 Small Block Mopar FX Series -3cc Flat Top Small Block Mopar Forged Piston Set 4.040 inch bore Pin Dia.: 0.984" Comp Height: 1.802"339 Small Block Mopar, FX, Comp Height: 1. 802, 3cc Flat Top , PIN: . 984", Full Floating or Press Fit, Ring Groove: 1. 2 1. 2 3MM, Stroke: 3. 310", ROD: 6. 123, Approx Comp Ratio: 62cc 10. 46, 64cc 10. 21, 72cc 9. 33 Effective June 15th 2026, These Sm These Block Mopar 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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6300-4040 340 Small Block Mopar FX Series -3cc Flat Top Small Block Mopar Forged Piston Set 4.040 inch bore Pin Dia.: 0.984" Comp Height: 1.802"