DOHC hemi A925

When comparing valve size the circumference is what makes the "window" that air can flow through, not the area of the valve.

A quick example would be the Ford Mod 4 valve, 2 - 1.45" valves have 9" circ.
With the small 3.55" bore let's say a 1.9" valve = about 6" circ.

If you take the circumference and multiply by the lift it gives the actual size of "window".