Picked up the bolts today and confirmed through two gm mechanics that there are, in fact, TTY bolts. Asked if they ever reuse them… got the side glance look and a smile.
Btw, no Loctite on the threads.
My thinking is the same as Not A 45, once stretched, don’t do the to 90 degrees thing.
For what’s it’s worth, I’m replacing mine because, as I stated above, I went to 90 on them and I feel that’s too much stretch, for used bolts.
Hope this info didn’t go to far off from your topic, redcoats1976.