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Hard to imagine that much oil flowing past the valve guides. Exhaust port sees mostly positive pressure, so it'd have to be the intake valve guide/seal. Plus.....if it were the exhaust guide/seal, the oil wouldn't get into the combustion chamber and the exhaust valve would look cleaner. These are just guesses.
I still suspect the rings. How wide is the ring gap?
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Man of Carbon Fiber (stronger than steel)
Mocha 1978 911SC. "Coco"
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