a 90 degree drill (and a left hand drill bit)would be a better option.Head removal can be a rather complex operation, with many ways to go wrong and potentially destroy your motor. Some Head repair specialists may be willing to help you to remove and replace the studs, for a fee of course, but it would be more economical in the long run, even if you do not make mistakes in head r&r..materials and parts would set you back quite a few $$$..plus time
pomandrew, April 2009
