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Porting isn't just about taking a die grinder and changing the port shape...
I think it was Judge Ito said it best when he called it a 3D process.
Good porters can actually keep the stock intake port shape and get it to flow better just by redoing the contour within the passage!
Think about it!
If the entire intake path was straight, then changing the port shape will change airflow dramatically.
Because the intake path takes a very abrupt bends to get into the combustion chamber, there's a lot more voodoo that just grinding metal away here and there...
It'll take tons of fluid dynamics theory to hash all this out...
In general, a smaller port will give you better (port) velocity.
Velocity is GOOD, especially for low end.
-Ted
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