***LIMITED ITEM PLS ALLOW 4 BUSINESS DAYS HANDLING TO SHIP*** Replica style 3-7/16 inch bore piston set has a 8.5:1 compression ratio and is oversize .030. Piston set includes Hasting rings 2 wrist pins and 4 circlips. Pistons have a steel expansion control strut cast. **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 HARLEY: 1941-1977 FL, 1971-1977 FX,