Thoughts On Fuel Distribution Dams (Intake Manifold)

The first issue is you can not predict how the air and fuel act in the intake manifold. No one can, but! There are patterns that come and go. To this end.....

The intake has the runners cast as close as the engineers idea as possible since it was on a sheet of paper first and then cast second in holes it acts or performs as they hope it will.....

The stock runners need the dams to help balance out the mixtures. Be it for the dam to slow down or (IMO, more correctly) speed up the charge through a smaller orifice, to help every thing come into balance or closer to it.

As far as a mod to a stock head.... vs a ported one....
This is a question I also asked myself. Once ported, equally.... which is not 100% possible port to port, this mod could still be useful. But how do the flow rates of each cylinder head port compare to each other and to the stock head vs ported head may hold the key.

I have never seen anyone list a port to port flow test.
I have never seen anyone list a intake manifolds flow rate runner to runner. Or more importantly the intake on the head!
Ported or stock for intake or head.
Once you have this done, then you can see what cylinders from the intake to the valve are going to be strong or weak. From there, truly, from there and only there can you make a call to what can be done.

Since none of us has the equipment time or money to do this, (maybe a member or two?) the only way your going to figure out what works and doesn’t is to track test.