Keith Black dome piston set is .010 oversize with a 7.2:1 compression ratio for 1980-1984 80 Shovelhead 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 .010 over sized for a 3.498 bore and has a 8:1 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 temperature. **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.
Fits:
FL 1978-1984
FLT 1979-1983
Fx 1978-1984
FXR 1982-1983
UOM: SET
Country Of Origin: USA
Suggested Items: 11-1364 – 80 Shovelhead Piston Ring Set .010
Accessory Items:
16-0622 – Ring-O-Matic Ring Compressor Tool Kit
16-0029 – Connecting Rod Clamping Tool
60-0167 – Cylinder Boring Service
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