What vacuum lines I will need to keep and where to reroute olds ones that I need to use thanks .
You will need to keep the feed to the vacuum motors under the dash. You will also need to keep the feed to the Carbon canister for the Emission system if it is being retained. If you have cruise control that has a vacuum interface, you will also need to keep that. The vacuum lines to the PCV and power brake systems need to be retained. If your distributor has a vacuum advance, you will need to keep the feed for that. If you are retaining the EGR system, you will need to feed that as well. Take careful note as to which accessories run off of throttle plate vacuum and which ones run off of manifold vacuum. As long as you keep items that were hooked to manifold vacuum and throttle plate vacuum hooked to their respective sources, you should be ok.
www.fitechefi.com has a technical support page that has some useful setup info. These systems take a lot of work to get peak performance out of them and can be very involved to set up.
The distributor will run off of "throttle plate" or "ported" vacuum. As does the EGR. Pretty much everything else will use manifold vacuum. There should be a decal under the hood which tells what goes to what on the original carb..
The EGR will go through a ported vacuum switch, which sends vacuum to the EGR valve only after the coolant temp gets to a particular low-temp threshold level.
I would think that FiTech tech literature would indicate which vacuum ports on their unit yield ported or manifold vacuum. Power Brake vacuum usually comes from a fitting which screws into a manifold runner itself, although some have a separate port on the back of the carb/FI unit just for that. HVAC vacuum and maybe cruise control vacuum can come from a vacuum tree that can also have the power brake vacuum nipple on it. Sometimes, the cruise control vacuum comes from the power brake booster check valve fitting.
PCV will be hooked to manifold vacuum, as will the carbon canister main vacuum source. It's not as onerous at it might sound if you understand how it all works and what makes it work.
IF you really want to see a vacuum hose "bad movie", look under the hood of a '85 Olds with their 307 V-8. Or a later '60s Ford V-8.
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