gotta 80 fairlady Z just did a top end rebuild and keeps blowing water out the back of the head. No I'm not getting any water in my oil. and not losing any compression. Any body got any idea how to fix this??

I assume the coolant is not exiting from inlet or exhaust passages?

There is a welch[freeze] plug at the rear of the alloy head that could be the culprit, although they are normally all replaced when a head is reconditioned:disappoin.

The plug may have a hole rusted in it and it has started leaking under pressure:nervous:

That's him in the RED circle.

yeah that does thank you