2303-4155 383 Small Block Chevy FX Series -16cc Dish Top SBC 23 Degree Forged Piston Set 4.155 inch bore Pin Dia.: 0.927" Comp Height: 1.425" Piston Series Option:FX-1 4032 Alloy Because the singles you are

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

one second ring and a 3-piece oil ring set

308 Small Block Chevy

We then pin fit the piston pin bores accordingly for the

329 Small Block Chevy

2303-4155 383 Small Block Chevy FX Series -16cc Dish Top SBC 23 Degree Forged Piston Set 4.155 inch bore Pin Dia.: 0.927" Comp Height: 1.425" Piston Series Option:FX-1 4032 Alloy Because the singles you are407 Small Block Chevy, FX, Comp Height: 1. 425, 16cc Dish Top, PIN: . 927", Full Floating or Press Fit, Ring Groove: 1. 2 1. 2 3MM, Stroke: 3. 750", ROD: 5. 7, Approx Comp Ratio: 58cc 11. 05, 64cc 10. 39, 70cc 9. 79 *