This may be helpful? I recently changed inlet manifold and found a few bolts loose and oil laying in the steel valley tray/gasket thing.
There were no paper gaskets just the metal tray which was leaking this had allowed the intake to suck oil and air and also exhaust from the manifold heating. there were no external signs of leakage it turns out I had 3 cylinder that burnt oil and they are now showing signs of the carbon clearing with use. A good day
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