Thread: rear cylinder head stud

I need help, does any know what size socket fits the rear cylinder head stud that keeps(covers) the last bolt that holds the cylinder to the block? I thought it was a 7/32 but its tries to slip.

Put two of the exhaust manifold nuts on it and tighten the outer one on to the inner nut, then try to back the inner one off, it will remove the stud and give you a lot better grip on it.