SBM head velocities and there application?

I'm trying to come to grips with this part of head performance, people talk about velocities a lot when discussing heads, carbs, headers etc... But in an vague abstract way no definitive numbers on what the head velocity is for a given head and what those head velocities will work with (cid x rpm). I hope we can figure out the velocities of the heads we generally have available and what displacements and rpms they work best with.

Now I'm not saying these formulas and these fps guidelines...

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