Question about holes in cylinder head

Question on 2012 Griso8V Tenni:
It looks as if I have a bit of a leak on the left cylinder head, on close inspection I found two, I believe, vent holes the upper one appears open as I was able to insert a small hex key pretty much all the way in (~2.5"). I would have expected it to gush out oil but it doesn't.
The lower hole under a fin, difficult to see in, is the one that appears to leak.
Should either or both be plugged?
Many thanks

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This is the upper hole


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This is the lower hole

BTW same issue on the right cylinder : lower hole is leaking a bit, the upper one is bone dry.

Upper one is the water drain from the plug well. I'll have to go have a Squizzy at one of the spare heads at work out where the other one goes.

Thanks Pete

Hey Pete any thought as to what that second vent hole is for? I’d like to plug it or have it sorted before my long trip this summer. Many thanks.

Sorry, I've been running around like a chook with its head cut off getting organised to fly out to Canada on Friday morning and it slipped my mind. I'll try and have a Squizzy this morning.

Pete

Whereabouts in Canada are you going to be?

We're doing the trans-Canada with side trips west to east then spending some time on the eastern seaboard of the continent before heading back NW from West Virginia/North Carolina via Indiana, Chicago and the Dakotas before heading north of the border again and meeting our daughter who is coming over to Vancouver for a conference and spending some time with her in BC.

Pete

Let me know if you’re going to be in Halifax, Nova Scotia, on the Atlantic coast. P.msg me.
Luca

With Mr. Roper on vacation anybody else want to hazard a guess as to the use of the lower hole in the cylinder heads (see pics above). As I mentioned they seem to seep oil and I would like to plug them with JBWeld if appropriate. comments or feedback greatly appreciated.

Sorry, I was run off my feet before I left, (In Sydney now.) I think that is just a secondary drain. I'd be replacing the plug tube o-rings as a first step.

Pete

Pete Roper wrote:

We're doing the trans-Canada with side trips west to east then spending some time on the eastern seaboard of the continent before heading back NW from West Virginia/North Carolina via Indiana, Chicago and the Dakotas before heading north of the border again and meeting our daughter who is coming over to Vancouver for a conference and spending some time with her in BC.

Pete

Damn, I just came back from West Virginia last week...
Put about 1600 miles in that State, nothing but twisties! Hell yeahhh!!!
GRiSO loves WV. lol

OK thanks Pete.