The ONLY way to remove exhaust related bolts/nuts is with a "blueflamewrench".
Works (almost) every time without snapping off.
chuck wrote:
> Hey You Guyz,
>
> Operated on the exhaust manifold this weekend. All 3 mounts
> from the exhaust pipe to the manifold had at some time been
> replaced by 5/16-18 cheapo bolts, which had since
> corroded. I spent one evening spraying penetrating oil
> and tapping it in, every 1/2 hour or so, and tried them next
> morning. One freed up. Two snapped with just the torque
> of 1/2 way up a 3/8 drive ratchet. Got one drilled out and
> retapped. The last one, the outside edge of the hole, the
> "ear" just crumbled when I tried to drill it out. Like dust, man!
>
> I have cobbled it back together with 2 studs and then a bolt and nut
> in the slot left by the break. Works fine. hasn't fallen off.
>
> But --- I'd like to find a replacement exhaust manifold. The
> usual sources seem way high on a new one. And Vizard seems
> to downplay LCBs for non-hot motors such as mine. I guess
> that leaves a good used one? Suggestions (beside EBAY, of
> course) for sources of such like?
>
> thanks,
>
> chuckC
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