That's logical. The 62mm is newer. The dyno results are....dyno results! I kind of chuckled at the backlash. Hell....I didn't photo shop the results! I could go back and duplicate them again. Back in the day we just called it "finding the sweet spot" of the motor. I built a 383 stroker before that had $3000 in that was never the perfect combo. In contrast I built a small block 400 that I nailed. I think the post above regarding the IROC Zs says it best. Some motors are just stronger. I haven't ruled out a INmotion tune but I'm actually worried about leaving that sweet spot and trying to get back to it.

As always, thanks for the input Doc.