The one stud that never strips is the one that holds oil pickup.That stud is VERY difficult to get out, but it can be done. I did it with a lot of swearing and I had to dent the pickup a little with a good-sized hammer and drift. Then I could get a wrench into the assembled motor and remove it. So much easier if the case is split............
I think you meant ALWAYS strips. I did the bent wrench tango to do the replacement. What a PIA.