I am trying to figure out the vacuum system as I do this. Perhaps someone can help me with what is necessary and what is not.
I have a 403 that runs pretty strong but I acquired it with much of the vacuum components disconnected as an aftermarket edlebrock aluminum performer manifold and 750 Holley carb were added.
I have found in fixing all that the vacuum advance on the distributor is not hooked up. Nor is the charcoal cannister, any of the vacuum lines associated with the air cleaner (except the main line down to the valve cover), or the small vacuum line that controls the AC system that is supposed to have a check valve in line somewhere.
After market chrome valve covers are also added.
I have attached two photos of the basic 403 vacuum system. The first photo is one that I found for reference - the second photo is edited to show what is not hooked up on my system (circled in red) - is not hooked up - the yellow shows only the manifold vacuum going down to the transmission and that is all that is currently hooked up to the manifold vacuum.
My brake booster is to the rear base of the carb and noted in Blue on the second photo.
I have to fix the vacuum system - I have a vacuum port open on the front base of the carb that I believe to be ported. I think I need to plug that line and run the distributor, transmission and AC controller off of the Manifold Vacuum - is that correct?
Where do I connect the check valve and the AC controller vacuum line to the system?
What is necessary on all the other components not hooked up and what is the simplest way to include them if they are necessary? Can I bypass or remove the cannister?
Do I need to start a different thread with this topic?
Please advise.
Thank you.
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