If you have access to a MIG welder or someone who has one you can try this. Place a nut that is at least one size smaller than the bolt over the broken bolt and tack it in place on the inside of the nut. Build it up,from the outside of the nut into the center. This will ensure good contact between the nut and the broken bolt. Build it up until it's flush with the top of the nut. Then use a box end wrench or socket on the nut and turn it out. Usually the heat from the welding will be enough to help break the bolt free, but you may also have to apply some heat to the block area around the bolt to get it out. Hope this helps.
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