Heating the area around the broken plug does not work very well because the cast iron takes so long to heat that the broken piece will also get just as hot or hotter defeating the reason for the heat. It can help with aluminum heads but not for cast iron.
The Tractor Vet's method works much better. By heating the broken plug and not the head you force the plug to expand more than the hole in the head. By getting it red hot you get the metal in the plug to a point where it deforms. When it cools down it will be smaller than the original size allowing it to be removed much easier. Do not use this method with aluminum heads.
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