Within a v8 engine the induction cycle the drawing in of the air and fuel of each cylinder is long enough that its combustion process will inevitably overlap the next cylinders charge that occurs in the firing order. Each has its own merits and its own drawbacks so.

Hughes Engines Tech Center Single Vs Dual Plane Intake
Single plane vs dual plane. The single plane was only stronger from 5600 rpm to 6800 rpm. Single plane manifolds have a single intake opening into the plenum and feeds all 8 cylinders directly. This engine produced 630hp with a single plane intake and 580 with a dual plane. August 29 2019 by randy this overview is to provide the basic differences in how these different features function. A dual plane intake manifold has two separate plenums that each feed only four cylinders while a single plane intake manifold has a single open plenum that feeds all eight cylinders. The larger plenum area is less restrictive and supports a higher power range than a comparable dual plane manifold which has a wider power range and works better at low rpm.
Mar 23 2015 8. First focal plane vs second focal plane vs dual focal plane. Not going to beat a dual planeon the streetwhen you get deeper gears more converter more head work cam compressionover 6000 6500 peak power the single plane starts working good around here. In the opposite corner is the sp1. However the dual plane was within single digits of horsepower and torque up to 5500 rpm and at 4000 rpm the dual plane was 60 hp and 80 tq better. The dual plane is a high velocity piece designed primarily for wide power band street applications.
It is not to offer a judgement as to which one may be best for any particular individual shooters requirements. It has a manifold height of 4550 inches. Unfortunately for the single plane the mild 351w combination was. The classic intake battle between the racy single plane and the dynamic dual plane usually ends up looking something like this.