I posted a few times before on an old thread about a my EVO leaking oil and asked if anyone had any thoughts. After a few suggestions I changed the umbrella valves in the rocker boxes, as suggested, with no luck correcting the leaking. Another suggestion was change the air cleaner, so I did that, putting on a new Ness Big Sucker Stage II, but that didn't help. So I figured that I would start from the top on the cylinder heads and replace every gasket there was in the rocker boxes. Well I got the boxes off and if the pictures come out I'll show you the gaskets that are between the boxes and the cylinder head. They have shrunk up so much that the holes for the bolts and oil ports have become distorted. Guess I found my leak.