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You might try slithering a little Kroil or PB Blaster down in the hole. And, incredibly enough, I have SOMETIMES had luck tightening the plug just a smidge before trying to loosen it. Anything that you can do to break that bond between the aluminum head and whatever coating is on the plug will help, obviously. You might even try warming up the engine and spray a little of that freeze spray that's used for finding cold solder joints in electronics boards onto the base of the plug. Otherwise, I see some heli-coil inserts in your future. Good luck!
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