Today I removed the intake manifold to get to the breather box and it sure made for easy access. While in that area I realize that it would be a good time to renew the hose to the heater valve . Well, the breather box was'nt that bad. It had a small amount of oil sludge but lots of flakes . I am soaking it in gasoline for the time being as I await the new O ring. I took the opportunity to clean the throttle body as well but one thing I noted was that the number four intake port on the head had significantly more carbon build up compared to number one. I dont know if that is typical or not.