Helix2 or 3. Pulled this off Don's site and I'm guessing it's Doug's truck. Looks like they stopped at 3500 although it was still making power but tailing off. Wonder why it started to tail at 3500? Maybe Don will jump in here. Whatever the optimum upper limit the question at hand is, should I go ahead an yank the short block and balance it even if I only will turn 3500? Part of the trick here it seems to me is how to make lots of power but do it with as much reliability as possible. Just because you can turn a stock bottom end 4000 doesn't mean that it likes it and will take it for 100k miles. I'm trying to find that solution that results in high output but will also last awhile.