2080-3766 305 Small Block Chevy FX Series -5cc Flat Top SBC 23 Degree Forged Piston Set 3.766 inch bore Pin Dia.: 0.927" Comp Height: 1.26" Stroke 3.480" 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

Printed on two sides

407 Small Block Chevy

943 pin pistons

including potentially having to re-balance the rotating assembly

2080-3766 305 Small Block Chevy FX Series -5cc Flat Top SBC 23 Degree Forged Piston Set 3.766 inch bore Pin Dia.: 0.927" Comp Height: 1.26" Stroke 3.480" Because the singles you are312 Small Block Chevy, FX, Comp Height: 1. 26, 5cc Flat Top , PIN: . 927", Full Floating or Press Fit, Ring Groove: 1. 2 1. 2 3MM, Stroke: 3. 500", ROD: 6, Approx Comp Ratio: 58cc 10. 09, 64cc 9. 37, 70cc 8. 77 *