There is a relationshop between the manifold volume/velocity and the plenum volume.
Personal opinion is that the upper LS Holley LID without at least some volume below the lid will feed the majority of the air to the back of the plenum. Lean rear cylinders and rich front cylinders.
With the right EFI system you can remove duty cycle on the injectors on those cylinders but they will not make the power of the front cylinders. Just an observation from a lot of dyno testing. Marcella's intake looks the way it does for a reason.
Tom V.
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"Engineers do stuff for reasons" Tom Vaught
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