If you ever tried to run a small block MoPar to the RPM they were running you’d know why they did it.
IMO, if you have all your **** together you can reliably run 8500. After that it’s a crap shoot. Past 9k is just death on the lifters and everything else.
I get it, but being a mere mortal i would never have even thought bout moving a lifter bank... just amazing stuff.. and that's why some guys are legends :)