Briggs 20hp Oil Leak

[utilityguy]

I recently purchased a lawnmower with a 20hp Briggs. Unfortunately, I didn't know it was leaking oil.
I'm trying to determine where it might be leaking from. I assume that it's either from the cylinder, the crankcase or the head.
If anyone could point me in the right direction from these pictures, I would appreciate it very much.

The engine is: 407777-0119-E3

 

[Rivets]

From those pictures I’m betting cylinder head gasket.

 

[utilityguy]

From those pictures I’m betting cylinder head gasket.

I think I'm going to try to clean it all up and see if I can see where its coming from.

 

[Tinkerer200]

It is fairly common for this engine to have a cylinder head gasket leak but not to the outside, inside to the push rod gallery. It is common for it to have a sump gasket leak to the outside under the right cylinder head as you are facing the cylinder heads.

Walt Conner