Installation will require no modifications, just remove stock 883 cylinders and pistons and replace with the S&S 883-1200 big bore conversion kit. Pistons have a dished piston dome and are stock weight. Therefore no re-balancing is required and will fit stock 883 heads giving a nice 9.4: 1 compression ratio. Incl. installation lube, head, base and exhaust gaskets and instructions.
Sopii vm 86-21 XL883 Sportster