Rear Cyclinder Oil Leak

[jonsamson]

2008 Nomad 40,000 miles
Replaced Cam Chain Tensioners at 25,000
No TFI
No Air intake mods
Pipes changed to VH

I have a oil leak that is pouring out a hole that is on the rear cyclinder. The hole is left of the chain tensioner.

I can't see any threads where a screw is supposed to go. I have inserted a bar-b-que scew in and it goes in about 4-6 inches into the block.

When the bike starts after warm up oil will start to pour out. There is no oil leaking from the cam plugs or the tensioner assembly, I could see it pouring out of this hole

Is there supposed to be plug in here? I have a shop manuel and I can't find where this is located in the book, or the internet, or any exploded views I have looked at on the internet.

Why is this happening? and how can I stop it?
Is there a screw missing?
Is there a plug of some sort?
Thanks
Jon