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Upgrade your Harley-Davidson Big Twin engine with the KB Performance Piston Kit model KB263.010, designed specifically for 74-inch displacements with a +0.010-inch bore. Crafted from high-strength, T-5 heat-treated 390 hypereutectic aluminum alloy, these pistons deliver exceptional durability and performance. The advanced material ensures a tighter fit and extends piston and ring life, making them ideal for high-performance applications. Each piston is diamond-machined to strict tolerances, with a weight variation of less than one gram and dimensional precision within half a thousandth of an inch, ensuring smooth operation and reliable sealing. The kit includes two pistons, piston pins, spiral-lock pin clips, and Hastings moly rings, providing everything needed for a complete installation. Replacement rings and pin lock rings are available separately for future maintenance or upgrades. KB pistons are engineered to be installed tighter than standard pistons, reducing piston rock and improving ring seal, which enhances overall engine efficiency and longevity. Due to the piston’s thermal conductivity and design, special attention must be given to the top ring end gap during installation, and detailed instructions are provided to ensure correct setup. Proper installation and ring gap adjustment are crucial for optimal performance and longevity of the piston assembly. Whether rebuilding or upgrading, this piston kit offers a high-performance solution tailored to demanding Harley-Davidson Big Twin enthusiasts seeking reliable power and durability.
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