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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. View Related Article
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