So, getting back on topic ... I've searched and cannot find the sources I once knew for this information.
Could have sworn I had see a calculator of some kind for Carb cfm vs. engine size & use. They are All Over the Place for plenum-style manifolds, single & dual plane, but the individual runner manifold info escapes me.
I think the source may be a 'desktop-dyno' type software I have ... somewhere ... unfortunately, it doesn't show HOW the results are calculated.
Certainly, there are those formulas used for venturi sizing ... that's a
form of calculator that can be expanded upon, I suppose. Obviously you can't use a 42mm vent for a 40mm throttle plate.
Then again, this is part of the 'calculation'/choice ...
So, if anyone runs across this information, please pass it along ... love to see the formula and how it is generated.
TxT