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Re: oil and instant fouling
Valve seals only control oil for the stems/guides.
Compression is sealed by the valve face/seats.
If the cam is new, and wasn't installed by you. You may need to check the preload on the lifters. And possibly check that it hasn't lost a lobe.
Refreshed, should generally mean it was re-ringed, re-bearinged, and seals/gaskets. But, not machined. Otherwise it would just be described as resealed.
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