Here's my opinion. Take it or leave it...
Measuring and comparing port volumes (especially on these engines) is not that meaningful.
The CSA (cross sectional area) at the critical point(s) is WAAAY more important.
CC'ing Two ports and then trying to draw conclusions from that is a fools endeavor. It can, and
will, mislead you every time. It just isn't a meaningful enough measurement to draw any
specific conclusions from. (other than one port holds more liquid than the other. It doesn't
mean chit)
I rarely ever CC a port. If the air speeds, (Actual and theoretical) are where I'm shooting for then
I don't give a $hit about the port's CC. I may check it just to see what it is, but I NEVER use it
as a design parameter.
CSA and air speed is what counts. The total CC is a byproduct and a misleading one at that.