Magnum Head porting for the beginner, Pt II Exh

I think I have a SpeedTalk interview with Darren Morgan.. I'll have to see if I could dig that up and see exactly what he's saying.
That could be sliced a number of different ways.. A larger valve with the correct shaped port would hit 325 earlier in the lift cycle, than a smaller one. Which would dramatically change 'blow-down'. Not to mention the effect on 'overlap'.
Interesting, nevertheless. He's no dummy.