So I just spent a few hours pulling the head off the Z24 in my Navara. I thought the head gasket had blown (apparently they delaminate on Z24s quite regularly), but no such luck.
This is the exhaust side of the engine:
So yeah, someone has drilled and tapped a new hole under the proper exhaust manifold stud, scoring the top of the block in the process, then spot welded some threaded rod in there. Was gunked up with some sort of gasket goo.
Is it worth having this head fixed? My thought is no, but finding Z24/2 engines at a decent price is pretty difficult.
Also the block, can that be machined out?