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I have to agree here with Legman. You'd better get someone who is sure about what they are doing. Welding cast aluminum isn't as easy as welding structural aluminum. Internal stresses from the casting process can easily cause more cracks in adjacent areas.
From the picture I think this is what happened to you. An internal flaw, or stress line, was aggravated by tightening the drain plug. I would guess that there are more stress lines that you can't see. Applying heat to the effected area may cause them to pop.
A professional welder will know what to do to avoid this. Look for someone who has experience welding on aluminum heads.
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