[unruhjonny]

I have an intake (that I have for a spare engine) which I need to remove that plug from, so I'm all ears on precisely how you pulled it!
Was it simply:
1) douce with penetrant
2) heat with torch till it stops bubling/smoking
3) try to move plug
4) repeat
??

I had my car's original rad recored about twenty years ago;
unfortunately for me, I didn't realize till later that the old guy tossed the ID tag that my rad had on it!