I dont think your gonna have a problem after you powder coat it. Just make sure you clean all the powdercoat off the machined surfaces. Get some 400 grit sand paper and if you have acess to a granite block. say it down and spray it with some wd40. then run the the head to clean it up nice. I think if its warped its gonna be so little that when you bolt it down, its gonna straighten out. Just check for leaks but we have never had a problem with PC'd heads.