[Jeff Lee]

Hilghly unlikely NHRA would have a blanket rule of "170 CFM" intake or even 170cc volume to cover all makes as there are many makes which exceed these numbers (both CFM & CC as delivered from Detroit. Also, highly unlikely NHRA would carry a flow bench with them to check flow.
Now, would NHRA allow porting to published SS port volumes? That's more realistic but I would opinion highly unlikely. At least not in the near future...