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Easy trick for you to do which you do when you bleed the cooling system. Stick the coke bottle in with enough fluid in it so you can see it. If you get lots of bubbles continuously, even little ones, the something is gone whether its the head or gasket.
A good mate of mine runs a shop. Last quote i got off him to do a head on a zd30 patrol was 2200. So not motor replacement money. This was a retail quoate as well it wasnt for me.