To report back in. If you are like me and do have one of your bolts fused to the head. Fret not. a 3/8-16 tap works perfectly. The tap drill for it is a 5/16 which fits exactly into the port on the head, just need to run it in by hand to clean the carbon out and tap it. You will need one of the more expensive t handle tap holders since the space is limited. Like so.