I saw him disconnect the vacuum when adjusting the timing, but it was hooked up when the dyno runs were performed. Is there a reason it wouldn't be connected? I understand vacuum advance doesn't do much at WOT (because of vacuum drop at WOT), but I guess I didn't question if it should be hooked up at all when doing the dyno run. I had never read that before, and I'm by no means an expert at dyno testing.
