Static and Dynamic Displacement and HP

An engine is an air pump. Nothing more, nothing less.

More air (and the fuel to go with it) means more power. Nothing more, nothing less.

Hp per cubic inch is volumetric efficiency, nothing more, nothing less.

You're going to make up to a given amount of power for a given amount of air. If you have a smaller motor, naturally aspirated, it's gotta spin faster to process as much air as a larger n/a motor, if the volumetric efficiencies and everything else are the same. All the other stuff is just getting more air in and out for a given rpm.

All this other talk about ratios and blah blah blah is just mental masturbation. Nothing more, nothing less.