IT sounds like it could be valve seals. It would require you to take the head off and have new seals put in.
You can put the new ones in the freezer overnight, to shrink them a bit and help them slide in easier. I used a puch to get them out, but it was no easy feat. A press would be nice, but I don't have one.a press to get the old ones out and the new ones in.
http://www.highlifter.com/store/catalog_utility.html to be even more specific...http://www.highlifter.com/store/bearing.html One of those SHOULD work for you. The first is to the general catalog, the 2nd is to the bearings themselves.Hey foreman lover, that link isn't working for me any chance you could put up another link? thanks