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I always like to hear this big lazy port vs a big well designed port kind of discussion. What makes the port to big or even to small? Depending on if we are basing this off for every engine or a particular combination. Big port on small cubes is going to need a lot of rpm to make port efficient. It might never become efficient if you can't spin it high enough. A big ci motor is different. More ci will move more air at a lower rpm vs a small ci. But it also depends on how many rpms, both engine sizes, and rpm. Rpm is cubic inches also.



How about you go check mis cross section and valve size on 360 LS3 chevy then get back to me on the large port not working on small CI or need big RPM to make it work.

A properly designed larger port for giver CI will work better than the BS high velocity small port.

And as I said this is only 3" min CS not large by todays standards.