bellows looked good cleaned my valves, pistons are in the correct way. it did not bog piror but i also had a pipe isped of the stock one. ran like a raped ape b4 it blew up. then it did run fine after the rebuild, for a day then i went and changed the 500 main to a 480 seeing i took the aftermarket pipe off. didnt have time to look at the fuel pump but weill be doing that in a little bit. slp ported cyls,