11-2251 - 80 FLH-FX Piston Set Standard

The Keith Black 390 hypereutectic 3.5 inch bore piston set has a 8.3:1 compression ratio and is standard size. Piston set alloy is cast in a permanent steel mold and includes rings. **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.