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Which one is broken? As long as its not a stud on the inner bend of the manifold it could possibly be done without pulling the manifold. When i was thinking of how to fix it on my car i was going to use the flange as a guide to help center the bit as i drill the stud out.. you may get lucky with a reverse drill bit also here. Many times i see the studs completely back out over a time, and more often than not the studs also unthread as you turn the nut. Pulling the manifolds off isnt too bad though if thats what it comes down to. The hardest part is getting them at the right angle to remove.. they really only come out one way. Also a great opportunity to inspect the manifolds for cracks at the merge collector and flanges at the cylinder head. I can almost guarantee you will find some.
I ended up pulling the head off to replace the 20 year old head gasket though, so never did try it.
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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
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