[Wbulk]

I agree with Olddog. Since you didn't say anthing about white smoke coming out the exhaust I would be looking now for a leak from a gasket first and next a crack. A crack could be anywhere in the engine but be evidenced by the milky susbstance in valve covers. As the coolant heats up and turns to steam it rises and you can usually see it in the valve covers. When you pulled the intake what did the gaskets look like. It's all evidence to finding the problem. Look for the small tell tale signs. You may have to pull the heads and go further.