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A technical diagram that illustrates the emission system for Ford trucks from the model years 1973 to 1979. The diagram specifically details the Exhaust Gas Recirculation (E.G.R.) system for 1977 F150/350-8 cylinder 351M and 400 cubic inch engines, as well as the 1978 F350-8 cylinder models. It displays various components such as vacuum hoses, gaskets, and valves, labeled with part numbers and connecting points, useful for vehicle maintenance and repairs.