Finding the correct pistons and gaskets to rebuild an overbored engine can be challenging, but you're in luck! These WSM Overbore Top End Piston Rebuild Kits are high-quality and feature construction that meets or exceeds OEM specifications. Every kit is made of high-grade materials to ensure it can withstand whatever your ride puts you through. These kits contain overbored pistons, ring sets, wrist pins, racing needle bearings, head & base gaskets, intake & exhaust gaskets, and improved E-clips. These rebuild kits are also available in the platinum series, featuring specially hardened tops and an enhanced skirt coating for increased performance and longevity. This kit is for cylinders that have already been overbored. WILL NOT WORK WITH STOCK BORE CYLINDERS/SLEEVES.