I'm in the process of fixing two broken exhaust manifold studs. I wish now that i'd just forked over the money to the dealer, but thats hindsight. Anyway, when I took the head off, I turned it upside down to drian some fluid. When I turned it back over I found two metal rings (they look like small, short pipe) .4 inch long and about .35 in diameter. There are two "holes" in the head that they appear to fit into, but I'm not sure that a good way to determine what they are or where they go. I'll try to attach photos and see if someone recognizes them and can tell me where they need to be when I put this thing back together.
Thanks all,
jim