5066-4090 442 FE Ford FX Series -24cc Dish Top FE Ford Forged Piston Set 4.090 inch bore Pin Dia.: 0.99" Comp Height: 1.39" Piston Series Option:FX-3 2618 Alloy with Lateral Gas Ports - XR .225 Wall Pin Upgrade - Spiro Locs Approx Comp Ratio: 44cc-12

Approx Comp Ratio: 44cc-12

399 Gen 5 LT Direct Injection

326 Chevy LS

more than that and it would have been more cost effective and better to replace the whole set

5066-4090 442 FE Ford FX Series -24cc Dish Top FE Ford Forged Piston Set 4.090 inch bore Pin Dia.: 0.99" Comp Height: 1.39" Piston Series Option:FX-3 2618 Alloy with Lateral Gas Ports - XR .225 Wall Pin Upgrade - Spiro Locs Approx Comp Ratio: 44cc-12434 FE Ford, FX, Comp Height: 1. 39, 24cc Dish Top, PIN: . 99", Full Floating or Press Fit, Ring Groove: 1. 2 1. 2 3MM, Stroke: 4. 125", ROD: 6. 7, Approx Comp Ratio: 65cc 10. 1, 72cc 9. 5, 76cc 9. 18 NOTE: Most FEseries OEM connecting rods require narrowing at the pin end to achieve proper side clearance within the 2. 5inch pin boss. Aftermarket rods are typic Thesey manufactured with a narrower profile and therefore do not require this modification.