Manifold Destiny
Manifolds have evolved substantially over the decades and, what was trick yesterday, is past its prime today. Notice from the layout visible beneath these two-plane intakes how the modern RPM intake, on the left, branches the runners into individual passages well back near the plenum. The older '70s-era two-plane is more of a log design, with the ports sharing a common passage and then splitting in a "T" junction to their respective port. Lost in the earlier design is effective runner length, and the opposed cylinders are poised to rob or dilute charge from one another.
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