Ok i just got my valve cover powder coated and i put it back on three days ago, yesterday started it up and heard a different noise then normal. So i popped the hood and listened it is coming from under my valve cover sounds like grinding and it is loud when after u rev it a couple of times. I have no idea what it could be, i didnt touch the cam gears or timing belt, didnt touch the valves. Anyone ever have this happen?? Or have any idea what it could be.