ECS Holley Carb question about Vacuum

[Suregrip391]

Hi guys, I just wanted some info on my carb, my car is an original 70 Challenger 383 auto with a factory Holley 4218 California ECS carb. My question has to do with the ported or "timed" vacuum port connection on this carb. Was it ever used? Or just manifold vacuum for the distributor vacuum advance? The reason I ask is because my carb had this fitting on it for the ported/timed vacuum and after I got it back from restoration it was gone. Pics attached. Looking at the factory service manual it does not show it is there at all.  Only on CAS carbs but my ECS carb definitely had it. Not sure why and was just wondering if any carb gurus here could shed some light on this topic for me? The restorer said it was good to go, Thanks very much. See yellow arrows....ignore the pencil

[cudabob496]

Before you had the carb worked on, were you using that port, that is now missing?

[Suregrip391]

My car has a universal Holley on it now, I tracked down a date coded original, so no, I never saw it hooked up.

[Chryco Psycho]

the dist should be connected to ported vacuum & generally that is the port where it will hook up , I have seen the fitting / tube fall out , is the hole open , can you feel vacuum in there as you increase RPM ? most cars run better with this advance blocked & more initial timing but you can dial off the vacuum advance so it will not advance but it will still look stock

[Suregrip391]

I have not installed the carb yet, probably won't be till late April when the car is out of storage. I just got it back from being restored ( carb) Which led me to my next question, won't this just be sucking vacuum since I have no way to cap it off now? Do those fittings just "press" in? Or does the carb need to be opened back up to install?

[Chryco Psycho]

they just slide into the hole from the outside . I wonder if the port below in the base is ported vacuum

[Suregrip391]

From what I understand, all ports below the throttle plates are manifold vacuum, all ports above are ported vacuum. I looked and it's below, so it must not be ported vacuum.

[Bullitt-]

must be manifold vacuum as it's the port they use in this article to connect a vac,gauge
http://forums.holley.com/entry.php?429-How-To-Adjust-The-Idle-Mixture-On-Holley-Carbs&s=cec0085ccf7406f371b38530751922bf

[swede-cuda]

  i have 4 -70 383 4 speed carbs[4367]and the meteringblocks[6361] all have that hole without any fitting in it. the vacuum to the dist connects to the pass side nipple.    its not a 4218 but maybe the same?

[Suregrip391]

I'm going to get a factory hose connector and install it, it's just a press fit, the factory service manual says this is the location for the distributor vacuum advance. If the car runs better with it in the lower port of the carb (manifold vacuum) I can then just cap it off. But this way I have an option of "timed" vacuum advance as the factory service manual calls it. Thanks for helping. Once I get the carb on and car running I'll post which worked Better.