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they'll work better on that hard bolt. Only the carbide drills will break easier if you're not careful. Also, apply some heat as stated. Even if it's only with a heat gun or by placing a halogen light up close. After heating, spray in the penetrating oil The heat will expand the material enough to allow the oil to wick farther into the threads. I haven't broken any exhaust bolts in years using the heat and oil application method.
____________________________ '93 n/a slicktop stage 0 My CarDomain
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