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The KB Performance Piston Kit, model KB258.030, 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 deliver exceptional durability and precise fitment. The diamond-machined finish ensures a tight fit, contributing to longer piston and ring life while maintaining minimal piston rock for optimal ring seal and engine efficiency. Each kit includes two pistons, pins, spiral-lock pin clips, and Hastings moly rings, providing a comprehensive solution for engine rebuilds or upgrades. Replacement piston rings and pin lock rings are available separately for ongoing maintenance or customization.
KB pistons are designed to be installed tighter than standard options, reducing piston movement and enhancing overall engine performance. Due to the material's thermal conductivity and piston design, special attention must be paid to the top ring end gap during installation, and it is recommended to follow the included instructions for proper piston clearance and ring installation. This ensures optimal sealing, performance, and longevity of the engine under demanding conditions. The kit is suitable for enthusiasts and professional technicians seeking a reliable, high-quality piston solution that maximizes engine power and durability.With a compression ratio of approximately 8.6:1, this piston kit is ideal for performance applications, providing a balance of power and efficiency. The precise manufacturing tolerances, combined with the use of premium materials, make this piston kit a dependable choice for restoring or enhancing your Harley-Davidson Evolution engine. Proper installation following the provided instructions will help achieve the desired engine performance and longevity, making this kit an excellent investment for serious riders and mechanics.Features:
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