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That's what I was thinking but it looks like there's some small grinder marks around it, doesn't look like it goes anywhere, I put a pic inside it and it just stopsLook at it carefully - It looks like a drilled/machined hole, meaning it's supposed to be there if it is.
If that's the case it's nothing to worry about.
Also, a pic of it from a wider angle (Further away from the spot) will help others here determine if it really is supposed to be there or not.
Thanks for the feedbackLooks like a machined holes for draining the valley, they look like a dead end, use some flexible wire they go to a 90 degree into the crankcase, great condition assemble it and run it.