80 Evolution Flat Piston Set.005" - Keith Black KB258.005 - Evolution 1984-1998

Keith Black #: KB258.005

Keith Black flat top piston set is.005 oversize with an 8.6:1 compression ratio for 1984-up Big Twin Evolution models.

The Keith Black 390 hypereutectic alloy is 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. Pistons are.005 over sized for a 3.498 inch bore and has a 8.5:1 compression ratio. 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 teperature. **Note: Run engine at moderate speeds for at least 500 miles avoiding excessive running in lower gears in order to properly break-in new pistons and rings.

Fitment:

Installation instructions (PDF)