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Message: <blockquote data-quote="Fred W" data-source="post: 1400769" data-attributes="member: 3828">Its an Allen head bolt.  So you would want to try a slightly larger bit if you went that route.  Or, Ive been successful hammering a slightly oversized Torx bit into a rounded out Allen head.  Problem in this case is you are hammering on the top of your cylinder head so you want to go kind of easy on the hammering.  Id suggest getting penetrating lube on the bolt and try to heat the surrounding alloy without heating the bolt if possible.  Grinding or drilling the head off will be tough down inside that hole, but eventually that may be the only recourse.  Once you get the pipe off and the valve cover off you will have good access to put vice grips on whats left of the bolt.Id stay away from the EZouts   They are hardened and brittle.  When you snap one off inside a bolt thats when you know that you are truly ******.  Up until then there are many better options like drilling out the entire bolt and then heli-coil.</blockquote>