Dyno operator error :) I've laid down quite a few 800+ passes with no issue, Olee made some on a dynojet and some on a mustang. Mostly the same results with different trq numbers.
I think on a dynojet I made 839-1500+ftlbs and on the mustang I made 836-1375 ft lbs

I believe this is the truck.

https://www.dieselbombers.com/member...-blah-blah.jpg