oily plugs

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LakeRat32

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I've got a 5.7 Vortex and one forbthe spark plugs has oil seeping from behind the plug. Number 7 cylinder, completely dry above and to the sides, it is not a valve cover leaking, already checked that. It is not fuel, I've tested that, how could oil be leaking down from a spark plug hole? For the life of me I can't think of anything.
 

Tonyrodz

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How's the tip of the plug? I don't understand, is it coming from inside the cylinder? If it is, I'd say it could be a valve seal.
 

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