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The KB Performance Piston Kit, part number KB263.020, is engineered for high-performance Harley Davidson Big Twin engines. Made from high-strength T-5 heat-treated 390 hypereutectic aluminum alloy, these pistons are designed to provide a tighter fit and extend piston and ring lifespan. The diamond-machined pistons are held to precise tolerances, with a weight variation of less than one gram and dimensional tolerances under 0.0005 inches, ensuring optimal balance and performance. Each kit includes two pistons, pins, spiral-lock pin clips, and Hastings moly rings, providing everything necessary for installation. Replacement rings and pin lock rings are available separately for ongoing maintenance or upgrades. KB pistons are manufactured to allow a tighter fit than standard pistons, resulting in reduced piston rock and improved ring sealing for enhanced engine efficiency. Proper piston clearance and ring end gap are critical for performance, especially considering the pistons’ excellent thermal conductivity and design. Users should follow the included instructions carefully during installation to achieve the best results. Designed for a 3.437-inch bore with a +0.020-inch oversize and a compression ratio of 9.0:1, this kit is ideal for riders seeking increased power and durability in their Big Twin engines, offering reliable performance and longevity under demanding conditions.
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