Your going to get 20 opinions on dyno hp numbers which can all be related to calibration and or who’s the biggest BS machine trying to sell motors. What I can tell you is that the spread your showing is to great and 48 is into open alky motor range, I think many might agree with that statement. My opinion on dyno testing will always be the same, does it run consistent from top to bottom and can it be replicated on track, numbers are nice but don’t buy into it until you see and feel the difference. I can get you a great number just before it blows up. ;-) My dyno is a 2+ mile long track and it works great.