Well, the fact of it is, as I said in the beginning that oil does wash the carbon into your engine, and by pulling air through your engine through a metered vacuum leak, that exchanges more air inside the engine, allowing more moisture and acids into the oil.
Speaking of old Vettes, here is one I built quite a few years back. Funny enough I painted it the same factory blue as the K3500 I recently saved, lol.
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While I'm sure not suitable for your tastes, it just had a couple K&N fiters on the valve covers on the big block, maybe a little drip off one occasionally.