When i got some chrome valve covers, i decided to replace the bolts with stainless steel, big mistake, when i was torqing them down i snapped 2 heads off on the passenger side and 1 on the drivers side. I just drove it like that for awhile, cause i didnt want to mess with it any more, well now, oil is leaking pretty bad in the back "of course the hardest spot to reach". I tried using a hacksaw and cutting a slit into it, but the stainless bolt just bent and snapped in half. What can i do to get those suckers out of there? I cant drill them out because there is not enough room