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I have the same problem. The usual suspects would be the intake manifold gasket, however, it could be a cracked block or head, or uneven mating surface. Last year my 383, (stroked 350 chevy) had a problem with the driver side cylinder head. I use aftermarket aluminum heads by ProTopline. The problem was the oil drain passage in the head wore through to the water jacket and promptly destroyed the lower end and camshaft. The head manufacturer did not stand good for the issue. Anyway, I would start by changing the intake manifold gaskets. Also, do not use the rubber gaskets that come in the gasket pack as they are all but impossible to line up. Simply use a 1/4 inch bead of black RTV gasket cement on the front and rear of the block-not the paper gaskets on the sides that go against the heads. Be sure to use a little extra RTV where the paper gaskets meet the silicon beads.

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Q: What causes water and oil to mixed in a 350 Chevy engine?
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