When you say you're "heating it up", what are you using for your heat source and what is it you're heating? You'll never get it hot enough to free up using a propane torch; you need acetylene. Also, you can't heat the aluminum, as it will melt before you get it hot enough.
You need to directly heat the plug; it will break free once it's hot enough. Get your pipe wrench adjusted and ready, then heat the plug with an acetylene torch. Try not to heat the surrounding aluminum; focus the flame on the plug. As soon as the plug starts to glow red, grab the pipe wrench and try to turn the plug. If it doesn't turn easily, apply more heat. It seems counter-intuitive that heating the plug will free it, but it will; you're breaking the chemical bond between the iron and aluminum. Note that if you get the plug too hot, there's a risk of setting the oil in the pan on fire, but most likely it will just boil.
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Today's Featured Article - Adding an Hour Meter - by Steven Gussey. This article tells how I added an electric hour meter to my 1942 Farmall H after rebuilding it. I wanted to keep an accurate maintenance schedule for my rebuilt engine and the implements I use with my tractor, but the H was never available with a tach
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