Edelbrock Pro Flo 4 EFI

ocdart said

Good points all.
I was wondering mainly about the port airflow velocity between a single-plane and dual-plane manifold considering the size difference between the much larger single plenum of a single-plane intake compared to the "split" right/left plenums of a dual-plane manifold.

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Not sure there, I'll have to see if there are any articles on the web. The only ones I've seen talk about the cfm difference between manifolds. There never seems too be much discussion on velocity (in the magazines), I believe the topic of velocity has been brought up multiple times on this forum when talking about head porting. I'd be curious to hear from an engineer involved at the OEM level and see what kind of testing and determinations they find and come up with in regards to their manifold designs. Just for comparison the magnum 5.9 "kegger" intake manifold versus the GM LS engine is similar looking so the engineers are finding something out in R&D.