Vacuum port on intake manifold

[Snotty]

My car didn't come with power brakes. It came with a one-bowl master cylinder and no booster. I upgraded to current 2-bowl setup, with a booster and the vacuum has always come from the carburetor since I put in.

Doesn't matter; that's still what that port is for. Cap it off.

 

[Fishfan]

Restorations 521 has a really nice assortment of detail parts for our C bodies as well as other Chrysler products. At the bottom of page 26 they show some available vacuum nipples such as the one you will need. They used to have ones with even more smaller nipples on them but I am not seeing those any more.

This is a great source of a lot of hard to find parts anymore that make the difference between having a nice restoration complete down to the last details vs a more run of the mill one.

A site to bookmark in my view.

https://521restorations.com/c-body/?sort=featured&page=26

Great link. Thanks. Yeah it looks like this is the fitting I currently have: https://521restorations.com/vacuum-fitting-3-8-npt-with-1-8in-vacuum-port/

And it's 3/8 NPT. Gonna cap it off.

 

[Fishfan]

Doesn't matter; that's still what that port is for. Cap it off.

"Intake Vacuum Hose Fitting - 3/8 NPT with 1/8in vacuum port for cars w/o power brakes that have either AC or Air Grabber. Also 60-65 cars for heater control vacuum w/o power brakes."

https://521restorations.com/vacuum-fitting-3-8-npt-with-1-8in-vacuum-port/

 

[Fishfan]

Turns out I had the right sized cap on hand. It came off the new water pump I just installed.

 

[Loadrunner]

There is a fitting that goes there if you have power brakes and/or AC

Or a vacuum gauge, here plumbed with a custom made vacuum hose adapter.