The first good run with this motor in, it got hot and lost water, so went back to old radiator, new thermostat etc.
But then still ran on ocation, so pressure tested it, still nothing. Seems it only leaked on ocation, but as soon as it started to leak it would PISS out! but i could still not find the leak for 2 months. until dad used the pressure tester at his work and finally found it.