Quote:

1/3 of mine I was able to remove with the help of a propane torch/wax/various penetrants....

1/3 I broke off with above efforts.....

final 1/3 as well as extracting the broken studs were removed by my machine shop for $10...



Sounds familiar. I had a '69 Chrysler 300 2-door, broke a stud and spent a frustrating 5-6 hours trying to get it out. Then I realized it would've been faster to just remove the head - had the head off in 45 minutes and the machine shop fixed it (and a messed up spark-plug thread) for $20.

https://i.imgur.com/tmuGzov.jpg