2000-4155 350 Small Block Chevy FX Series -5cc Flat Top SBC 23 Degree Forged Piston Set 4.155 inch bore Pin Dia.: 0.927" Comp Height: 1.56" Piston Series Option:FX-3 2618 Alloy with Lateral Gas Ports - XR .225 Wall Pin Upgrade - Spiro Locs When you order this option

When you order this option with a new set of LS

This part # is for a replacement single cylinder ring set

308 Small Block Chevy

Because the singles you are purchasing were not made at the same time your original pistons were made there will be variations that could effect their weight

2000-4155 350 Small Block Chevy FX Series -5cc Flat Top SBC 23 Degree Forged Piston Set 4.155 inch bore Pin Dia.: 0.927" Comp Height: 1.56" Piston Series Option:FX-3 2618 Alloy with Lateral Gas Ports - XR .225 Wall Pin Upgrade - Spiro Locs When you order this option377 Small Block Chevy, FX, Comp Height: 1. 56, 5cc Flat Top , PIN: . 927", Full Floating or Press Fit, Ring Groove: 1. 2 1. 2 3MM, Stroke: 3. 480", ROD: 5. 7, Approx Comp Ratio: 58cc 11. 73, 64cc 10. 92, 70cc 10. 2 *