1980crimsonCutty

I am having a terrible time trying to get my vacuum lines hooked up right after a buddy of mine put on my new rebuilt carb (holley 650). If anyone could take a look at these pictures and possibly help me out I would greatly appreciate it. Right now neither the canister or vacuum bulb are hooked up. I would like to eventually get my heater controls for heat, ac, defrost hooked up right too but for right now I just want to get it running right. If you need better pics or have questions please let me know...

joe_padavano

There are only two kinds of vacuum sources on an engine - straight manifold and ported (timed). The only things that use ported vacuum are the EGR valve, the evap canister purge, and the distributor vacuum advance (if you still use ported vacuum for advance). Everything else uses straight manifold vacuum, and EVERY manifold vacuum port is equivalent. PCV, power brakes, AT modulator, HVAC, and vacuum accessories all use any available manifold vacuum port. The specific one is irrelevant, they all function the same.

A manifold vacuum port will be at full vacuum at idle and drop off as throttle is opened. Ported vacuum is zero at idle, then climbs to match manifold vacuum as the throttle blades uncover the port in the venturi.

1980crimsonCutty

Thanks for the info joe_padavano...I went out and tinkered with it a bit and now it is running GREAT! You explained it very well for my vacuum novice experience to work through. Now to replace my valve cover gaskets to stop the oil from dripping on my exhaust. I do know how to do that one...
Thanks again!