the plastic pieces may be from the grommets in the valve covers; and the metal chunk looks like it could be a broken off tab at the end of the cam shafts. but none are broke off of mine now(maybe from a previous failure before I bought car. ill send you a pic Andrew since I'm not kool enough to be able to post pics here. lol I also ran the camera down both timing covers to the crank and all looks good. Many thanx btw for the hook up on that camera! it has been a valuable tool for my tool box.