Here isthe problem. The piston is now coming out of the cyl, so of coarse the domes have to be cut. The other end of the deal is this, the cyls will have to be raised also, wich in turn changes port timing, wich will change the way the bike runs. Who ported it? I would get on the phone to see what the specs they used are on it. You may get the pistons to clear, but it may run like shit.