What could cause this?

[WADS56]

coolent+oil= milk shake, most of the time the head gasket is the blame. Check your coolent leval if your oil is milky you coolent should be low. The spout on the valve cover connects to a vacuum hose. If you have oil on your plugs it could be that the rings are not seated, or a bad valve guid.

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347 W/ A-trim 6#'s, Canfield heads, out of the box Systemax II intake, solid roller cam. 11.1 @123mph 1.46 60FT

93lx 5.0 daily driver