Thanks for the replies! I do think I have a problem as when it gets hot, it spews the 50/50 coolant out and less coolant means more hotter! It does not have a heater so there is no problem with that and it is a zero pressure system. I'm going to start with the exhaust manifold gasket after the mating surface of the manifold is planned flat to remove pits etc. Then I guess a water pump if the gasket does not fix it.
