KB596LCA005 M8 114"/117" to 128" big bore conv. piston kit. +.005"

This KB Performance piston kit is engineered to convert 114-inch or 117-inch Milwaukee-Eight engines into 128-inch powerhouses. These forged 4032 alloy pistons feature a dome crown and are compatible with both oil-cooled and liquid-cooled heads, even those running valves up to 3mm larger than stock. Utilizing Line2Line self-lubricating technology, these pistons provide a perfect fit by wearing into their own tightest possible tolerance during initial startup, eliminating piston rock and ensuring a perfect ring seal. The kit is designed for 2017 to 2025 M8 models with the stock 4.5-inch stroke and requires 4.25-inch bore cylinders. With an 11.7:1 compression ratio, this is a serious performance upgrade for late-model baggers and Softails. These pistons are sold as a pair.