Liquid Wrench the hell out of it, wrap in a rag soaked with liquid wrench, let sit overnight, then get the pipe out again. The liquid wrench thing has worked for me, but your situation sounds pretty extreme.
Before using the big pipe you might want to try banging the wrench (with the wrench on the wrench flats of course) with a hammer, this is kind of a poor man's impact wrench. After you bang on it a few times try twisting it off by hand or with the cheater bar.
OK, I soaked my crank/pedals for 2 days in liquid wrench and gave it another shot. No luck. I'm afraid my favorite pedals are history. I could care less about the ****ty cranks.
At the shop we use an oxy/acet setup to heat the cranks and remove stuborn pedals & crank arms from bb's. The alloy crank will expand and the pedal usually comes right out. The idea of hitting the pedal wrench like an impact wrench seems to work well in conjunction.
I would hit the crank area with propane torch some more, propane torches take awhile to heat the area up.
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