Depends on hardness and size of the bit that broke. I've used a smaller cobalt bit to start hole on the broken bit or bolt, and then used a screw remover bit and wrench to remove bolts and bits alike - but its a pain. imagine a cylinder head hole is probably 3/8" or so, so that's an advantage over something smaller. dremel with a diamond tip would probably start the extraction hole better than a even a cobalt drill bit. Good luck, sounds like a PITA..oops 4hp bolt might be a bit smaller...
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10-05-2013, 07:18 PM
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