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While working on my exhaust I broke the bolts that hold the heat shield on the right side one is broke flush with the prechamber the other one is broke slightly above the prechamber. I have sprayed them with JB Blaster tried to get a grip with vise grips , even tried heating the prechamber and tried to drill one out and broke screws extractor off on stud. Any suggestions?
 

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The screws have rusted into the threads of the prechamber. Screw extractors will not work. I think you're pretty much left with drilling them out and re-tapping the threads. You can try the PB Blaster soaking it down 5-6 times daily for a week or so and maybe the one you can grab will break loose.
 
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