Question on port matching

Rat Bastid.
None of the you tube videos in this thread support your contention that the opening in the intake man where it meets the head should be bigger & that it helps power because a smaller opening kills power, posts 28,40, 89. You mention fluid dynamics.
Water is a fluid. To duplicate the above scenario, where the port in the head is smaller & overhangs, get a garden hose & aim it at the corner of your house. See if you get smooth flow...