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Upgrade your Harley Big Twin engine with the KB Performance Piston Kit, part number KB263.040, designed for a 3.437-inch bore and a +0.040-inch oversize. Crafted from high-strength T-5 heat-treated 390 hypereutectic aluminum alloy, these pistons deliver exceptional durability and performance. The precision diamond-machined surface ensures each piston is held to within plus or minus one gram weight and less than half a thousandth of an inch (.0005") in tolerance, guaranteeing a balanced and smooth operation. This kit includes two pistons, pins, spiral-lock pin clips, and Hastings moly rings, providing everything needed for a complete upgrade. Replacement rings and pin lock rings are available separately for future maintenance or upgrades. KB pistons are engineered for a tighter fit compared to other pistons, resulting in reduced piston rock and enhanced ring sealing, which contributes to increased power and efficiency. Proper installation is critical, so be sure to follow the included instructions for correct piston clearance and ring end gap adjustments. Due to the pistons' thermal conductivity and design, special attention should be paid to the top ring end gap during installation to ensure optimal performance and longevity. These pistons are an ideal choice for riders seeking reliable power gains and improved engine longevity with professional-grade components. Whether rebuilding or customizing your Harley engine, the KB Performance Piston Kit offers high-quality components backed by precise engineering for lasting performance.
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