You have gotten yourself in to one of my absolute LEAST favorite things to do. A dremel tool with a pointed caride bit will sometimes get enough of a divot in the EZ out to be used as a pilot for a Titanium coated drill bit to drill out the EZ out. Sometimes a really good pair of needlenose pliers can be inserted in the flutes of the ez out and turned clockwise to remove it. Be sure to remove the water pump if you haven't already to get some fighting room around this thing. I got lucky once after I gound a slot in the top of a spiral style ez out and was able to twist it out (again, clockwise) with a good slothead screwdriver. Good luck, tell us how you are doing.