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I take it your heat exchangers have not yet been removed so access is difficult.
Heat is the most effective if you can hit it with a torch.
If not, a long shaft air chissle will work. The nuts will be destroyed but will come off.
Before all that I soak everything in Kroil for several days.
Once the nuts are off and the exchangers down you can decide which studs are healthy enough to be removed and if you want to drill/tap.
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RarlyL8 Motorsports / M&K Exhaust - 911/930 Exhaust Systems, Turbos, TiAL, CIS Mods/Rebuilds
'78 911SC Widebody, 930 engine, 915 Tranny, K27, SC Cams, RL8 Headers & GT3 Muffler. 350whp @ 0.75bar
Brian B. (256)536-9977 Service@MKExhaust Brian@RarlyL8
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