APPLICATION:1941-1979 FL,FLH,FX, 1200CCFL 1941-1977FX 1971-1977DETAILS:Keith Black 390 hypereutectic piston set is .050 oversize and is for 3.438" bore. Pistons have a compression of 9.0:1. **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.
UOM: SET