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What might be of more interest to you. . .
If you increase the valve surface area opposed to volume you get a much faster intake. So if you have 2 square inches in one big valve you get x periphery surface area to the valve(which is the only area that can feed the cylinder). If you cut the valve size in half you have same area more periphery surface area and faster loading of the cylinder.
You have 4 valves and limiting the opening does what rk said and just limits your available power forcing you to drive more economically because its physically impossible for you to do different. If you can find a header with 5(3 in 2 out) you can achieve your late stage loading without sacrifing volumetric efficiency.
Downside is they are more complicated and very expensive if you wreck your timing belt. . .
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