I have my motor torn down right now. I also noticed quite a bit of
oil on the back of both intake and exhaust valves. I was burning a ton of
oil, 1-qt per ~200 miles. I do not run a PCV valve but I do have a tall solid breather on both valve covers as well as the intake. I am assuming my rings are bad hence all the
oil burning. My heads were rebuilt, valves, guides, etc about 2800 miles ago so I don't think they were the culprit. My assumption is with the amount of oil blowing past the rings and with the large cam overlap, 254/266 @ .050", the oil was getting to the top side of the valves? Seem plausible? When I pulled my intake the gasket seemed ok?
Mike