David Vizard - Which to prioritize - PORT FLOW or PORT VELOCITY?

What's the velocity in the port when the exhaust is pushing back into the plenum?
I give what is it ?

According to the chart it starts around 210-215 fps and lower which are generally fair size ports you'd have to go way out of your way to install. 215 fps would be 2.39" ave csa, that's bigger than a 190 trick flow, on a 5500 rpm 318.