slabghost":2v5wcbim said:
These water pumps are not pushing a lot of coolant.
I'm gonna have to disagree with that statement. I had my top hose off and ran the engine and that pump really put out! Aluminum engines heat and cool pretty quick and a properly working coolant system should be trouble free. Key here is properly working coolant system. Any one component not working correctly, from a bad thermostat, wrong coolant, too much water (yeah...too much water will cause a boil over real easy), fan coming on late, dirty radiator, clogged bypass or dirty cross over tubes will cause overheating.
Of course, a bad head gasket will also cause overheating, but lets not go there yet!
Joe has run without thermostats for some time with no reported problems. I personally always use a thermostat and have also had no reported problems.( :smilie_happy: )
You have'nt played with your timing recently have you?
Oh...a simple thing to check...is your expansion tank hose connected in the bottom of the tank? They often come off at the fitting in the tank allowing air into the radiator as the engine cools.