Howdy ya'll, Well, I loaded up my new (too me) fj40 on the trailer, towed it to a garage and began the tear down and inspection of the 350. Ok, not a teardown, but a small removal of the intake manifold and valve covers. Inside the intake manifold, and the headers, the ports for the fuel look fine, but what appears to be the water channels, there is a lot of build up. I don't know Chevy engines really well, watercooled engines for that matter(had a Baja bug for a while), anyway, is the build up a really bad sign? Is there a way to flush the water system? Should I be worried? Thanks for your help!