Page 3 of Intake Manifolds by Holley Performance Products, Inc.

manifold technical information about manifold terminology by terms of definition there are two basic configurations for v-8 intake manifolds single and dual plane the dual plane 180° designs feature a multi-level plenum design that essentially separates adjacent intake pulses by alternating planes while the single plane 360° models feed all cylinders through a single plenum the plenum is the large chamber underneath the carburetor mounting pads while the runners or ports direct the intake charge to each individual cylinder dual plane manifolds are preferred for street applications especially vehicles equipped with automatic transmissions because of a stronger individual carburetor signal that provides improved bottom-end performance by virtue of a less restrictive more direct design the single plane is superior for top-end performance single plane cut-away all cylinders draw from the same common place dual plane cut-away note that adjacent cylinders 2 4 draw from different isolated areas intake manifolds determining manifold height the manifold height measurements a front and b rear shown in the illustration below are determined in the following manner lay a straight edge across the carburetor mounting pad the measurements are taken from the manifold front and rear end seal surfaces to the bottom of the straight edge to ensure adequate hood clearance check the stock manifold height in the same manner and compare with the dimensions listed for the particular manifold of your choice tech line 270-781-9741 7

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