INTAKE MANIFOLDS, GASKETS AND COMPONENTS The wide range of Chevrolet Performance intake manifolds are cast-iron and aluminum for carbureted and fuel injected applications. These intake manifolds were designed specifically for GM engines so you know they will deliver optimum performance. Due to the profile of some Chevrolet Performance high-rise intake manifolds, hood clearance should be carefully checked before ordering an intake manifold.
CNC-Port-Matched Intake Manifold – Oval-Port, square bore, Holley Carburetors • Same as P/N 12363406, except it has been CNC-port-matched for GM aluminum oval-port heads with large oval-port heads (1975-and-older), and all aluminum heads with oval-ports
NOTE: Open carburetor spacer is not recommended with use of dual-plane manifolds.