When I was new to the quadracers I used them. The first time they bored my cylinder they did  a good job .the second time they left my cylinder out of round. My piston broke and my cylinder was .50 over and they bored to 80 over. Instead of telling me their was aproblem. They just sent it back to me. I guess they was afraid I would have stuck them  if they would have told me their was a  problem.  But anyway I ran that cylinder for a year almost and both side of transfer port still are cross honed and never clean up. Piston slap from the begin of the new bore. Then I paid for their port job one of the best in the nation he said it was. What a joke it was . So  I will never use them again. I only use the main builders now. If something is wrong with my stuff I get that call and say what do you want to do about this Instead of getting back half ass junk.