[Olds64]

HELP! I am tearing apart my 455 and when I took the pipes off of the exhaust manifolds 3 bolts broke off and are stuck in the manfold. The bolts are broken off flush with the manifold surface. There is about 1/4" of the bolt sticking out of the opposite side of the hole. What would be the best way to get these out? Should I try an EZ out, or should I drill them out with a larger drill bit and put a HeliCoil in? Someone at the auto tech center on base said I should heat them up with a torch and try to get them out the back of the hole with a pair of vise grips. I think the bolt would just smash and the threads would get damaged. I have never had any luck with vise grips. I will take some pics tonight if I get over to the auto tech center.