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Originally Posted by pawoSD
Well, if it couldn't be gotten out with those massive-tools-I-don't-have, I think I will make some sort of "invention" to warm the engine a little, such as a modified hot plate that magnetically sticks to the bottom of the oil pan or something, to keep the whole thing warm, that'd certainly make some difference. Its time to be creative and perhaps spend less money on the setup. 
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First get some "Kroil" and get it onto the threads several days in advance. Do this every day for several days.
Then on game day:
Get the engine up to operating temperature. Then get a bit of dry ice and a suitable pair of gloves. Press a chunk of dry ice on the face of the plug and hold it there for 6 or 7 minutes. If the chunk evaporates before 6-7 minutes are up, then get another chunk. Make sure all your tools are ready to go. You need to quickly put some torque to it after you remove the dry ice.
Remove the dry ice, install the allen wrench and use a large pipe to quickly apply the torque. Bring the torque up fast. Don't just slowly add force to the bar. You need to "crack" it loose.
If you followed all of the above, it has to release.