Another overheating situation 63 Slant six

slant 6's NEED NEED NEED the thermostat to be IN PLACE. get a thermostat, test it on the stove in boiling water (make sure it opens) and install it. not having one in will cause more issues or may even be your cause.

went through literally everything that's been explained above. new water pump, new radiator, head gasket, checked timing.. everything. It was not having a thermostat that ended up being the issue.