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Leland,
I work with aircraft and we have various ways of getting studs out when they break. Aircraft engines are a bit more expensive to pull out and apart than car stuff and so the tools tend to be a bit more exotic.
That said, I have several (three or four) types of stud pullers... one that grips the outside of the stud and as you turn the breaker bar it grips tighter on the stud and usually pulls it out. If you have enough meat on to grip onto, it usually works fine.
The others are mostly of the "drill a hole inside the broken stud" and then insert it in and slowly turn it with a breaker bar.
With heat we usually get them out as well as tapping the stud after heat on the head (tapping, hot wailing away on it) to try to get the threads to "unseal" themselves.
I would go to various tool places, Snap On, Matco, Proto, MAC etc and see what they have. If you want to take a look at the ones I have (esp the gripper type) email me and I will send you a pic. Might even loan it to you for a cold one if you cannot find one where you live... I am still unpacking my stuff after living in Europe and the ME for 11 years but believe that its somewhere in my boxes of spares.
Its worth a try as it would buy you time to do this at your leasure and when you have prepared for it, both financially and with your workspace and parts. An engine is a nice fall or winter project, and doing one when you are rushed is never the best option for me.
Good Luck,
JoeA
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