1970 F134 Pcv Question

I've completed a rebuild and am trying to determine if I need to connect the PCV line from the driver side valve located right above the fuel pump to the port located right below the carb.

I am not running the heater or windshield wipers. Both are disconnected.

I've been running the engine for about 50 miles after the rebuild as is without the PCV hooked up. Seems to be running a little rich and has backfired once and stalled, but started back up and I believe I just need to further tune the carb.

2nd question - My carb has a brass tube coming out and it appears it was attached to something at some point. Does this need a rubber hose connected to something else?

Pictures below for reference:
https://photos.app.goo.gl/d8KCpSCRWPMHDoo39

 

First what you are calling "driver side valve" is not a valve, it is a fitting, though it is not what I am used to seeing on a F-134, it is where the L-134 PCV system was connected. My F-134 has a large washer installed on the cover instead.

The plugged port in your intake below the carburetor would normally have a "T" fitting. One end would have a fitting for a small vacuum line going to the heater control, the end facing the front of the Jeep would have the PCV valve with a hose running from it to the tower on top of the rocker cover, and the third fitting a medium sized vacuum hose running to the output side of the vacuum pump on the dual action fuel / vacuum pump.


Below are two pictures of my F-134, one showing the PCV system, the other showing the big washer that blocks the older style PCV hole in the cover where you can also see where the vacuum line from the off side of the PCV T fitting goes to the vacuum pump.



You will notice the brass tube in the air horn of is not connected on my carburetor either, I suppose it should either be capped or connected to whatever it is supposed to be connected to. The air cleaner is off of my Jeep for clean up and painting, but there is a hose from that to the port on the dip stick tube. My heater is not installed at the moment, so have have plugged that side of the elbow to prevent a vacuum leak.

 

Oldpappy has it right with the PCV. The brass tube would normally be connected to the oil bath air filter, It is a vent for an early attempt at emissions control.

 

Thank you for the feedback.

I've been researching that driver-side port and really cannot determine what it's for.

Since I am not using vacuum for heater or wipers, I'll leave the intake port plugged.

My crank case vent on the valve cover is connected to my oil fill / dipstick tube, which then is connected to my oil bath air filter. This is from a 1970...interesting to see the different variations with the F-head.




https://photos.app.goo.gl/H4atd9bC76h2koxDA