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Probably kiwi cylinder heads.
Do good deals most of the normal diesel motors here but I do know it pays to get a better head gasket. Otherwise pretty good pricing and generally reliable

No.3 I know what you mean but extractors can help.
Know a mate that that did that to his 2.4 surf years ago for the same reason

What Dannyb said would be wort a shot. Pity i am not in a shop with normal steel, we could probably make one.
Same comments on Coby as everyone. As for Rage, do they have them in stock/ If you can...