I got the maths for you K-Rock
you dont use the valve size for the area you use the valve seat dia, as this is the last restriction to the flow, less the area of the valve stem. the reason you cant use the valve size for the area, is that at full lift the valve is out of the way and the seat is the last restriction .
CB inlet Area
area
Seat Dia 1.897 2.826527439
Valve Stem 0.341 0.091332911
area= 2.735194528
OK Martin, im with you on your calcs... You didn't specify the seat area or the window area in your original post on the numbers. I thought you were just going off the the raw valve diameter. ( FYi that is how we measure the basic number it over here ... valve diameter... buts it's just a coefficient to use as you work the port.
If I am fully mapping a port I use the seat throat area and window area at .050" lift increments and base my work off of that.
Pat did an awesome job on those ports, ( as he has done on several of his designs ) The flow numbers are right up there with any advanced wedge head in flow per Sq inch.
I have not measured any velocities on these heads but with an average cross sectional area of your port it would be pretty easy to get really close with some more math.
How big is your motor? And what RPMS are you turning?
cheers.