1976 vacume diagram

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I need a vacume diagram for a 1976 GMC Sierra 15 250 eng. 1 barrel carb.
has a integra head. I have bought two shop manuals and been to the libraries in two counties and been on the web ,mitchells, Chilton and etc. The vacume diagram for my truck is not there. Need help any ideas.
Thanks Bear

posted by  Bear

try this

posted by  osborste

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