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302 Ford Coyote
431 Big Block Oldsmobile
342 Chevy LS
39 Effective June 15th 2026
97 NOTE: Most FE‑series OEM connecting rods require narrowing at the pin end to achieve proper side clearance within the 2
6170-4060 2.5 - 151 Iron Duke FX Series -0cc Flat Top No Notch GM Iron Duke Forged Piston Set 4.060 inch bore Pin Dia.: 0.927" Comp Height: 1.57" Piston Series Option:FX-1 4032 Alloy 302 Ford Coyote155 Iron Duke, FX, Comp Height: 1. 57, 0cc Flat Top No Notch, PIN: . 927", Full Floating or Press Fit, Ring Groove: 1. 2 1. 2 3MM, Stroke: 3. 000", ROD: 6. 05, Approx Comp Ratio: 65cc 9. 65, 72cc 8. 89, 78cc 8. 34 *
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