Montana mentions a bottleneck in the airflow after the intake manifolds, and I'm assuming that he's talking about the openings between the mani and the head. I'd like more clarification on this.

Looking at a pic of the mani, there are 3 holes in the bottom. The combined area of the holes far exceeds the cross-sectional area of the 3" pipe feeding the manifold. So how could those 3 holes be a bottleneck?

Is that what he's talking about?