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The KB Performance Piston Kit, part number KB305.030, is engineered for high-performance Harley-Davidson Evolution Big Twin engines with an 80-inch displacement. Crafted from high-strength T-5 heat-treated 390 hypereutectic aluminum alloy, these pistons offer superior durability and thermal conductivity. The design ensures a tighter fit and longer piston and ring life, making them ideal for demanding riding conditions. Each piston is diamond-machined to strict tolerances, with a weight variation of less than one gram and dimensional accuracy within 0.0005 inches, ensuring optimal balance and performance. The kit includes two pistons, piston pins, spiral-lock pin clips, and Hastings moly rings, providing everything needed for installation. Replacement rings and pin lock rings are available separately to maintain peak performance over time.
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