4816-3705 4.6 Ford Modular FX Series -18cc Dish Top Modular 2V PI / Twisted Wedge Forged Piston Set 3.705 inch bore Pin Dia.: 0.866" Comp Height: 1.21" Bore Size 3800 in 96444 mm 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

429 Chevy LS

-10cc Dish Top No Notch

5/64 5/64 3/16 Moly Ring Set for Mild Performance Applications

4816-3705 4.6 Ford Modular FX Series -18cc Dish Top Modular 2V PI / Twisted Wedge Forged Piston Set 3.705 inch bore Pin Dia.: 0.866" Comp Height: 1.21" Bore Size 3800 in 96444 mm Because the singles you are306 Ford Modular, FX, Comp Height: 1. 21, 18cc Dish Top, PIN: . 866", Full Floating or Press Fit, Ring Groove: 1. 5 1. 5 3MM, Stroke: 3. 543", ROD: 5. 933, Approx Comp Ratio: 44cc 10. 09, 50cc 9. 35, 53cc 9. 04 *