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I went looking for a vacuum diagram for a 1977 F-100 I am helping an old friend redo. The truck turns out to have been built for California emissions even though it was from the Norfolk assembly plant and sold new in Southeast Virginia. He came through, and the truck runs great! Jasper rebuilt the engine, truck is being completely restored as it was her late husband's. He bought it after it was repossesed from the original purchaser.