Just got it back on the road and the exhaust flapper valve that was feeling so nice and free out of the vinegar bath is sticking at operating temperature.
Yup, they do that. Try again with the special-for-this-purpose solvent, but realise that this valve might be done working, permanently—refer to post № 6 in this thread.
I hate to wire it open while I chase a couple dozen other more important tasks on the car but that may be where I'm headed. Letting it stick when the valve is closed seams like the worse of two evils.
There is no "open" or "closed" on the Slant-6 valve; that's on V8s. There's "heat on" (rotated full clockwise as viewed from the front) and "heat off" (counterclockwise).
