Originally Posted by 360view

The iron V10 truck engine manifold has 25 inch runners with EFI.
The “plenum” volume of this manifold is far larger than the Long Ram.
This probably works far better than the balance tube.


Not in a long horn cross ram application it won't.

I have a vague recollection of a rule of thumb that says plenum volume need to equal no less than one cylinder's displacement on a multi cylinder engine. But that's probably out of date.

They say there are no such thing as a stupid question.
They say there is always the exception that proves the rule.
Don't be the exception.