Here another one I find interesting from Larry I kind of get it but not fully understanding why 2 speed gets away with higher velocities fps over 3-4 speeds ?
"from my Dyno testing along with Dragstrip testing this is what i discovered so far :
SuperStockers with 2-Speed Powerglide does not lose as much HP if an Intake or Exhaust Port has way too fast local CSA velocities
reason : 2-Speed has way less Engine RPM/SECOND rev rates -vs- 3 or 4 speeds
... so that the Chevy SuperStockers w/ Powerglides lose less HP
SuperStockers with 3-Speed Automatic Trans , such as, Chrysler SuperStockers have more HP loss with Intake or Exhaust Port that has way too fast local CSA velocities
SuperStockers with 4-Speed Manual/Clutch Trans lose even more HP "if" there's too fast local CSA velocities"