TwinTurbo.NET: Nissan 300ZX forum - I would add to try and use carbide drills.....
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Subject I would add to try and use carbide drills.....
     
Posted by canyoncarver on December 25, 2005 at 11:59 PM
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In Reply To look at it this way... posted by Zfreak(Dallas) on December 25, 2005 at 11:33 PM
     
Message 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.

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