I have a radiator pressure/coolant system tester tool I could loan out, it may help and im here in Jax. Also, i've had water puke out forever on a dry engine until all the air is purged... but im always using a t-stat in mine so that could be why.

8sec. street car, been there done that. Quitting when your ahead isn't the same as quitting.
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R.I.P.UN.