No t-stat and things are better (take longer to get too hot, cools off quicker) but still overheats....

I am getting desperate maybe...tempted to pull the heads and check the cooling passages for blockage.

Any ideas that would make an engine run too hot (as opposed to a cooling system that doesn't dissipate enough heat)?

hiway speeds are not good, temp wise, nor are long hills...just jumpin on it for amile or 2 seems to have no effect....i would expect hiway cruising to drop teh temp fairly rapidly - but it goes UP?

HELP!