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Re: Removing a broken bolt (and replacing an exhaust manifold)
you'll have to use a thing called a helicoil. if it's even possible to work with.
the drill-out thing is most likely made of HSS steel, and if so it can't be drilled out with anything less than a diamond drill or gundrill. carbide-tipped or whatever won't touch it.
you'd have to have it milled/drilled then threaded and insert a helicoil to make it the right size for a new stud.
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