Intake: All are at .008 or so Exhaust : Range from .016 to .018 All have 186 shims in them, one has a 189 (an intake I think). Im away from home and dont have my manual with me, so I dont know anything about these shims. Would I be able to shim these again, or has the tough exterior coating of Ti been worn off my valves? How much does a head rebuild typically cost? I probably shouldnt ride it like this, should I? Thanks guys.