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Originally Posted by Pete Burton
If you have the original threaded plug in there, some of them can be quite aggressive. When I rebuilt my engine, the only thing that anyone else removed was that plug. The guy who removed it(before he boiled out the block) said they had quite a struggle with it. I didn't have just the right wrench for it but something close. The threads are fine and probably 8 full threads of engagement. Start soaking with penetrant and heat if you can. Good luck
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Aggressive is putting it mildly.
I couldn't get that mutha out with an impact wrench. It took me and a friend, with a 4' extension over a 3' 1/2" breaker bar to snap it loose. That would have NEVER happened with the engine in the car (unless all manifolds are removed). But of course, if the heater is already installed, and you are just replacing the element, some channel lock pliers will get that out from below.