If you are going to use heat it is best to heat the adapter itself. Get it as hot as you can and let the surrounding area of the head stay cool. If you heat the head the cast iron will never take on heat fast enough compared to the broken part to expand due to differences in temperature. The brass will heat much faster than the surrounding cast iron. If you can get the brass hot enough it will expand faster than the cast iron. As it expands, once it reaches it's limits of elasticity it will start to deform and it tries to expand further. Once it deforms, when it cools it will start to shrink away from the cast iron. You just have to watch so that you do not actually melt the brass which could cause it to fuse to the cast iron. If you ise a propane torch that should not be a problem.
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