12363407 Intake Manifold, Oval Port For Holley Carburetors (CNC)
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.
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