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Take the 1-4 manifold off. The first thing i would try is reverse drill bit, start small (very small) and work your way up a little at a time. You may get lucky and the broken stud will back out. If this does not happen, i would skip the extractors and just drill the old stud out, and either helicoil or timesert the thread. I say this because if you break an extractor you pretty much sealed your fate and will be pulling the head.
The key to success is getting a good start with a center punch, then start with the smallest drill bit and working your way up 1 at a time. This takes forever, but you reduce your chances greatly of breaking a drill bit off in the head. GOOD quality drill bits are a must also.
Basically i would avoid using the extractor unless you are 'ok' with the potential of having to take the head off in the event it breaks. Another thing to consider is you said the stud is broken fairly low in the threaded hole, the extractor may not work in this case.
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Jon
1988 Granite Green 911 3.4L
2005 Arctic Silver 996 GT3
Past worth mentioning - 1987 924S, 1987 944, 1988 944T with 5.7L LS1
Last edited by Techno Duck; 11-29-2011 at 02:35 PM..
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