Kris,
I have had that problem in the past I believe. But....last weekend I drove all the way back from Tahoe, about 4 hrs, and haven't ran it since. Also, the side of the block had a fair amount of water on it. As I pulled apart the engine the bottom of the intale manifold was covered with milky
oil as well as both valve covers.
I'll get the head pressure tested and checked for straightness. If nothing turns up their I'll get the intake manifold checked the same way. If that passes then I guess I will reassemble then perform a leak down test to see if there is something going on with the block itself.
Any other ideas????
Mike