Death of a /6
I asked a similar question a while ago wondering if anyone had blown up a /6. Under normal situations, no one indicated a failure. It took cracked castings and extremely low oil situations to result in a failure. On another site, I read that the Hyper Pack 170 would turn 8000 rpm if you could keep the cam lubed. Since the stock electronic ignition box stops the whoopee at 6000, I don't see much of a problem.
Back when my fellow teens were getting rides, the ones with the fewest engine problems were those with /6 or Beetles. You could run either all day, flat out, and not hurt them.