'63 CA77, or is it?

[primer63]

At Loud Mouse recommendation, we have torn the motor down. Rookie mistakes ensued, including engine back together without breather guide spring. Back apart come he cases. In the process we discover stretched studs, a couple of which we noted the threaded end at a distinctive angle not in line with the rest of the stud.
New studs ordered. An entire set, not just the bent ones. You can probably guess my dilemma. How to get the old studs out of the cases?

What we've tried so far:
1) jamming two nuts on the stud to remove, in essence a lock nut
2) applying heat to stud
3) applying cold to stud
4) applying penetrant to stud
5) against my better judgement...vise grips

Have walked away from it to let penetrant work a bit.

Any help here?

[e3steve]

I had a similar issue in extracting the studs when I first stripped my casings ready for blasting (aluminium oxide blasting, in my case -- don't do it!).

I used a vise-grip in the end, but you must grip the stud close to the casing in order to eliminate torsional force absorption. They all unscrewed, but considerable force was required...

[malcolmgb]

This is the type of extractor I use.

As e3steve says grip the stud as close to the case as possible and use plenty of heat on the casing near where the stud goes in.

[primer63]

This is the type of extractor I use.

As e3steve says grip the stud as close to the case as possible and use plenty of heat on the casing near where the stud goes in.

Nevermind, Malcolm, I responded before signing in and didn't see the extractor picture. I see it now.
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Malcolm,
Was there supposed to be a picture of some kind of extractor, or are you saying you use vise grips as well?

I am being cautious with heating the case so as not to warp it. What do you use? Heat gun? MAP gas?