Static and Dynamic Displacement and HP

19DUSTER73 said

And maybe what we are seeing when keeping the top ends the same is how hard the bigger cubes are working the induction system?

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That could be a reason, I've heard that engines that need more rpm to make similar hp aka smaller engines need larger port cross section then larger displacement lower rpm similar hp engine.

So if port shape and maybe some of the cam timing were tailored for the smaller cid
We would have equal capability ?