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Perched atop the No. 494419 cast-iron intake manifold is a No. 7043270 Rochester Quadrajet carburetor. While at first glance both may appear externally no different than standard production units, the carburetor has a maximum airflow capacity of 800 cfm (standard engines used 750 cfm), and the intake manifold's runners were enlarged and closely match the overall dimension of the cylinder head's ports. Both are unique to the Super-Duty 455.