Amazing overheating problem...desperate
Very fine fracture in exhaust valve seat?
Thats a clever thought and THAT is the best clue so far...it could certainly close up after it warmed up, couldn't it?
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There is a Tom McCahill type in my circle of friends that speculated on a fine crack in one of the heads. Yours makes a little better fit to the symptoms.
Sooooooooooooooo. As of last week:
In the extreme: I changed the stat to a drilled 180 degF. I changed the pressure cap to 13 lbs. It has passed the morning test 3 times in a row now...crossed fingers. I'll keep you posted.
Transmission:
Old time transmission guys working out of their garages just don't seem to exist anymore. All of mine but one have passed on. The last standing is 78 and he just won't tear into mine...too much work.
I know someone but they are 750 miles away and probably $1500 to $1800...and thats R&R myself.