Quote: If the threads were chased and the bolt was lubed it should come out pretty easy. You may be able to tap the bolt out with a pointed chisel untill you can grab it with your fingers or a vice grip. If not its easy out time.
Id replace ALL the bolts with Arps! Whats this about you wanting 1 Bolt. Replace them all, mike
it should come out easy- if mr p bodys trick doesnt work (try that first) there should be no tension on the bolt unless it bottomed out
Replace them all, mike 
