Okay so my head is at this local machine shop getting some work done. Basically installing valves, springs, retainers, guides, and a mild p&p... well turns out some guy I know got his head done by this same machinist and now his head is giving him problems... well he says problems. He says the valves are making a tapping noise and no matter how much he tries to adjust them it won't go away...now to me this sounds like a error he problably but I dont really know much. The guy is blaming the machinst for the problem... what do you guys think? I mean how much error can a person make while installing a valvetrain? I have done it just to do it on spare single cam head I had laying around just for learning but never put them on a block and ran em to see how they came out... so how much error can a person make assembling a head??? And does this sound like his or the machinist fault? thanks for the input...