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When I had to do this to change the leaking oil line, I read and found that while some were able to remove it using brute force, the result was damged thermostat threads so this is what I did.
1) drop the entire line
2) try things like PB blaster and put moderate force. When it did not give I went to:
3) use a dremel-like took to cut the nut, being careful not to damage the threads. I didn't cut completely through, but used a screwdriver to finish opening up. Saves the thermostat threads that way.
4) picked off any material from the nut on the thermostat thread.
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1979 SC, Slant nose wide-body cab conversion. AEM Infinity EFI, COP, supercharged!
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