Before I take the dash apart I want to get a vacuum diagram so I can verify the correct routing of all tubing. Where can I find such a diagram for a 1970 with BB motor, A/C, Power Brakes, etc.
I have the wiring diagrams and noted that on the A/C page it shows vacuum routing for the A/C system. I find it strange that there is nothing in all the GM manuals I have (or at least I cannot find it). I really wanted to check the firewall forward vacuum routing.
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