6403-4040 410 Small Block Mopar FX Series -18cc Dish Top Small Block Mopar Forged Piston Set 4.040 inch bore Pin Dia.: 0.984" Comp Height: 1.457" Engine Size 7.0 - LS7 - LSX 03 Effective June 15th 2026

03 Effective June 15th 2026

77 NOTE: Most FE‑series OEM connecting rods require narrowing at the pin end to achieve proper side clearance within the 2

469 Pontiac Late

427 FE Ford

6403-4040 410 Small Block Mopar FX Series -18cc Dish Top Small Block Mopar Forged Piston Set 4.040 inch bore Pin Dia.: 0.984" Comp Height: 1.457" Engine Size 7.0 - LS7 - LSX 03 Effective June 15th 2026410 Small Block Mopar, FX, Comp Height: 1. 457, 18cc Dish Top, PIN: . 984", Full Floating or Press Fit, Ring Groove: 1. 2 1. 2 3MM, Stroke: 4. 000", ROD: 6. 123, Approx Comp Ratio: 62cc 10. 51, 64cc 10. 28, 72cc 9. 54 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.