"the bolt is sticking out of the block about 1/8 of an inch."
Above is the information given by the trucks owner. Seems that most guys prefer to weld a nut to the broken bolt and have given good advise how to do it. I suggested a using a left handed drill bit to drill the center of the broken bolt, usually drilling this way will spin the broken bolt out. Another method is to use a sharp punch or small chisel and slowly try to spin the broken bolt out, it takes patience and you have to be careful not to damage the metal around the bolt.
