Is the debris ferrous? I'd check with a magnet.
How expensive is a head gasket? I think at this point it's worth pulling the head. Although you have nothing to lose by trying to put a breaker bar onto the flywheel and trying in both directions. It's probably a loss--but it's worth the same in multiple pieces as it is in one piece. Nothing to lose by doing some teardown, and you might even get lucky.
How expensive is a head gasket? I think at this point it's worth pulling the head. Although you have nothing to lose by trying to put a breaker bar onto the flywheel and trying in both directions. It's probably a loss--but it's worth the same in multiple pieces as it is in one piece. Nothing to lose by doing some teardown, and you might even get lucky.