He is speaking from a general point of view that is misunderstood, what is comes down to in this case is....flow is power, the bigger valves give more airflow when cut and blended right, and especially the lower lift that is handy in filling the cylinder. These ports are small...so small that even if you opened them to be .060 thick in the entire port walls,floor,roof...the fps/air speed would be huge. Your machinist is not a this or that...he is just a machinist. The numbers I post are not BS, anyone who plays with sb mopars knows the x, j, o, u, blah blah are easy to get to 240 cfm, its not rocket science or a secret and yes you remove a bit...but It's no secret to those who work with these that the real work is getting up past that and controlling fps/air speed so it holds at lift.
