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I changed my intake manifold last week for a ported one.
There was a layer of oil in my stock IM's bottom. The oil was working its way down the port holes.
I did a search, and catch cans are popular with C5 owners, but not so much with C6 owners.
Got one . I put it on a month or so ago. It works! When you open the petcock on the bottom, oil comes out. So, it does stop the oil from going into the manifold. 1000 miles of driving and I got about 3 tablespoons of oil out the bottom.