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Keith Black KB305.010 Hypereutectic Piston Kit For Harley-Davidson Evolution 80" 1340cc
- Manufactured from high-strength, T-5, heat-treated, 390 hypereutectic aluminum alloy
- Allow a tighter fit and longer piston and ring life
- Diamond-machined pistons are held to plus or minus one gram weight and less than one-half-thousandth-inch (.0005") tolerances from piston to piston
- Each kit contains two pistons, pins, spiral-lock pin clips and Hastings moly rings
- KB pistons can be installed tighter than other pistons, this results in less piston rock and better ring seal (please read instructions included with piston for correct piston clearance)
- Due to the thermal conductivity and design of KB pistons, special attention is required to the top ring end gap (please read instructions furnished with piston for correct ring installation)
- Piston set .010" oversize and is for a 3.498" bore
- Compression ratio of 9.6:1 and includes rings
- Cast in a permanent steel mold which makes it possible to build a light weight piston that makes more power and uses less fuel and lasts longer
- The low heat transfer of the alloy keeps the skirts cool so piston expansion is minimal
- The combination of a low heat transfer piston alloy and high compression ring placement increases power and economy
- The high ring placement alone reduces detonation and increases the top ring temperature
- Replaces OEM: 16510-83A, 16512-86A
- Fits 1984-1999 Evolution Big Twin model