I did a complete review of everything under the hood. I came to the conclusion that I had been treating the symptoms of the overheat problem and not trying to fully investigate the cause. I think I may have found it! The exhaust control valve at the right manifold appears to be rusted and stuck (won't now for sure until I take the pipe off). However, this valve is designed to redirect exhaust heat through the intake and out the left exhaust pipe, to help warm up the engine in extreme cold climates. This would, if stuck, definitely make the engine run a lot hotter.
To be on the safe side, I ordered a replacement spacer to take the place of this valve from T-Bird Sanctuary, and it should be here by week's end. I will take the old valve out and inspect it and replace it with this spacer (in the southern Nevada desert climates, I don't image I will have too many issues with sub-zero temperatures!)
I will let you know how this all turns out. This valve, if the cause, was probably the cause of the overheat in the original post on the '66 T-Bird that started this thread posting.
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Jeff Medved
Las Vegas, Nevada
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