Take two identical sets of heads, both flowing 420cfm on the same bench. One done the old school way of a large by huge retangualr port opening, the other done with a more modern approach, taller, narrower port. There can be a LARGE HP potential between these two designs, yet both will pass the same amount of air. All I am saying is it aint ALL about a flow number. There is a lot more to making power than that. Just like a dyno its a tool, nothing more and they vary from place to place.

BTW I am no "PRO" racer, but I have spent many nights in Holiday Inns. Ive just fortunate enough to be around some very smart people near the top of the food chain in the sport and listen, watch and learn. Oh yeah having said all that I have a set of very nice CFE ported B1 Originals that need a home. Changed directions and don't need them now..