I could use a 1974 slant six manifold heat control valve expert!

slantsixdan said

I'm glad to have been wrong; let's hear it for not having to do another manifold R&R! Though I remain baffled at what was causing your noise; maybe what you meant by "boomy" is not what came to my mind with that word.

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Thanks, Dan. And thanks for the recommendation about the correct manifold heat control valve solvent. I went out and bought a can of the Mopar Rust Penetrant that you recommended and lubed the shaft up with it. Everything works perfectly and smoothly right now - just like a brand new valve. That stuff is amazing!