Aluminum and steel are dissimilar metals. The head is aluminum and the stud is steel. The heat expansion rates are different also. Aluminum expands at a greater rate than steel. You can use this to your advantage by gently heating the area around the broken stud with a heat gun. 9 times out of 10 the aluminum will expand enough to loosen the grip on the steel stud. Heat the area while putting pressure on the stud with the easy-out. If this doesn't work plan B is to drill out the stud. then re-tap for a larger stud. Plan C, replace the head. To perform any of the above plans you will need to remove and re install the head so due to the cost of a head verses the time and effort to save the old one. I'd go for plan C. You did want that performance head anyway, right?
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