Was flushing my heater core yesterday and it looked like the bolt for the upper heater hose nipple was loose, so I tried to tighten it a little and POP it broke off. I didn't know it was a shoulder bolt but I didn't really put any force on it to begin with so Im sure it was already seized. So....Anybody have any tips on getting a drill bit in there to use an easy out. I haven't tried removing the bolts from the dog bones and pulling the engine forward but Id assume its the only way Ill have a chance. Im amazed the pressure of the coolant system doesn't pop it out of the engine, guess that O ring holds pretty well but I don't trust it enough to leave it like that. Thanks