Hello Everyone, I figured I would ask on here before I spent the rest of the day searching online for the right answer. I broke off about a half-inch of a 5/16" Grade-8 Allen bolt inside the front of my 241 Dodge Hemi block, and I was wondering what type of hardened drill bit to buy? I spent the better part of yesterday tearing down the front of the motor and with the help of some friends, attempted to drill a hole in the broken bolt. Our plan was to drill a small hole and step up in drill bit size until I had a whole big enough to use an easy-out to remove the broken bolt. All was going well until we broke off a drill bit in the broken bolt, so now I'm guessing I'll have to buy some type of harden drill bit that will be able to drill into both the Grade-8 bolt and the chunk of drill bit inside of the bolt? If anyone one know what type of harden drill bit I need to buy it would be greatly appreciated? The motor is fully assembled, painted, and ready to run. I''m hoping I don't have to completely tear down the motor just to remove a broken stud.