80" Evolution Flat Piston Set .005
Description
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" 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.
Specifications
- V-Twin number
- 11-2217
- Manufacturer
- Keith Black
- Sold as
- 1 - SET
- Origin
- USA
- 2026 catalogue pages
- 202