When dealing with an ever varying intake valve opening (following a lobe) and a cylinder that has a non linear rate of acceleration from TDC to BDC...not to mention varying cylinder Pressure thoughout the RPM band....how can the flow through a port EVER BE CONSTANT?

Since it came up....I wonder what does anyone who understands the concept think of the large SP2P idea? Not as a race manifold (where a single is still king despite some runner to runner flow balance issues) basically as a conventional 180 degree dual plane with LARGE (VICTOR SIZED) independent runners to a divided plenum, this would give an extremely broad power curve and should flow better at high RPM than a conventional shared runner dual plane. The SP2P was designed way too small for low compression stock motors seeking high velocities at low speeds, it's a good idea it just runs out of steam (velocities get too high) to early in the powerband for a higher RPM application.

Probably the only way to balance pulses in a single plane intake (other than an independent runner) is probably a 180 degree crank, as someone said the drawbacks of conventional designs are too small to worry about and the all out race (Comp eliminator and Pro stock as examples) manifolds are scienced out to the 'Nth' degree for that specific application.