headbolt or any other bolt,If you can get it hot running the motor great, in My experience with stubborn bolts I have found if it doesn't come out easy a good shock with a hammer will help to break it free just dont screw up the head,and rather than an easy out I would drill a small hole through the center of the bolt this will releive some of the pressure on the threads,you can always open the hole up later to tap it.I have found nothing easy about an easyout if you break one then you really have problems in 30 plus years as a machinist I have seen many a broken easy out and taps be carefull and good luck
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