The Stovebolt Site Forums The Shop Area Engine Shop Anyone with a vacuum lines diagram for a 1969 c10 with a 250 6cyl

Does anyone know where I can find a diagram of the vacuum lines on a 1969 c10 with a 250 6cyl? I have a port capped off on the bottom of the carburetor, it must have connected to something at one time.

I don't have such a diagram, so the paragraph below is just an educated guess.

Any port on the base of a carb is usually considered "ported" vacuum. That means it usually doesn't supply much/any vacuum until the throttle is opened. It is mostly used for vacuum advance at the distributor.

Unless you want to go to originality, the vacuum diagram won't do you much good. That model came out with "emission controls" that didn't do much good. In fact they might have done more harm then good. It probably had an air injection pump. All that stuff is generally gone by now to get it to run better & get better gas mileage & make servicing easier.
Any capped off vacuum outlets probably were for this system. If you have vacuum to the dist. & any accessories like A/c & heater controls or power brakes, that is all you need.
I can find a diagram if you really want or need it.

George

You can find some manuals here linked in the first post here:
Truck manuals