6400-4060 410 Small Block Mopar FX Series -3cc Flat Top Small Block Mopar Forged Piston Set 4.060 inch bore Pin Dia.: 0.984" Comp Height: 1.457" Single Replacement Pistons 58 NOTE: Most FE‑series OEM

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

09 Effective June 15th 2026

270 Chevy V6

347 Chevy LS

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

6400-4060 410 Small Block Mopar FX Series -3cc Flat Top Small Block Mopar Forged Piston Set 4.060 inch bore Pin Dia.: 0.984" Comp Height: 1.457" Single Replacement Pistons 58 NOTE: Most FE‑series OEM414 Small Block Mopar, FX, Comp Height: 1. 457, 3cc Flat 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 12. 55, 64cc 12. 23, 72cc 11. 17 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.