Flow numbers and max HP potential

I always thought this was reasonable

HP = 0.25714 × CFM × No. of Cylinders

This indicates that on a V8, the airflow/power-correlation would be:

Flow(cfm @ 28 in)

PowerPotential (hp)

100...205.7

150...308.6

200...411.4

250...514.3

300...617.1

350...720.0

400...822.8

450...925.7

500...1,028.6

“Two engines can both make 600 hp—but one accelerates, the other won’t, either on the dyno or in a car. There may be a disconnect between cylinder-head flow and port volume. Generally, at a given horsepower level, you want to see max airflow out of the smallest port possible.”