valve cover - oil pooling

[Raptor]

That hole is nothing more than an exit path for oil in the spark plug well area, if you look on the front side of the valve cover, it goes all the way through. If it is leaking oil, there is a crack internally in the VC under the baffle. Unless you know for sure it is leaking there, I would look for a different culprit, I have never seen one leak there.