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I am starting the process of replacing the vacuum and wiring harnesses on my 1971. When I came across something interesting, and I am not sure where it goes yet, but just curious if its normal or not.
Off of the manifold there is a 3 way split, one goes to the brakes, one to the normal vacuum system, the other goes to a metal pipe that goes under the car.
This line going under the car is not in any of the documentation I can find, is this a mystery that I will solve when I get the car up a little or does someone have an idea that helps me know what I am dealing with before I get to that point?