Harley Davidson EVO Stroker motor S&S Piston Kit forged 89 '' hot set up pistons Big BoreHarley Davidson EVO Stroker motor S S Piston Kit forged 89 hot set up pistons Harley Davidson EVO Stroker S S HOT SETUP 89 S S Piston Kit 3. 5 x 4 5 8 stroker crank NOT STOCK Converts the stock 80" (1340cc) Evo Big Twin to 89" (1459cc). Approximately 9. 25: 1 CR. Kits include forged pistons, wrist pins, wrist pin clips and piston rings. Harley Davidson EVO Stroker motor S S Piston Kit forged 89 hot set up pistons Harley Davidson EVO Stroker S S HOT