Hey guys, this is a follow-up to my last carb question. I rebuilt one of the two I had and went to put it on my car, which is still at the seller's house, and discovered that it didn't really want to install very well, nor did it look like the one he had on his own car, which is the same as mine--a '69 dart with a 225.


There are parts on this carb that I don't know what to do with. I have taken these pictures and labelled the things I'd like to know about.

A) What is this big assembly on top here? What goes into this line? It looks like a fuel fitting because there's a wire screen in it but the carb already has a conventional fuel fitting on it.

B) I think this is a PCV fitting but on the owner's carb it's on the opposite side. Does this make a difference or should I just plug it in here? The thing is, there is another smaller fitting on the back side too. See D below.

C) This looks like an air bleed screw and I actually took it off the other carb I had because this one seemed to be missing it. Did I do right?

D) Ok, If the big PCV fitting is on the front side, what is this thing? Can I just plug it up if there's nothing on the car to go to it?


I did find some numbers stamped on this carb's body. They are 2739 and 4354. The number cast into the body is 12R-4285B.

C: idle mixture
B: PVC (doesn't matter where it is)
D: might be vacuum advance, it's either D or the one to the left of B. Plug whichever one isn't vacuum advance.

A: I'd guess that it's a vapor line, probably went to charcoal canister; the screen would keep the charcoal out of the carb if it started to fall apart. If there's a open vent in the carb throat, and you didn't have a vapor line, I'd plug it.

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Ed
64 Valiant 225 / 904 / 42:1 manual steering / 9" drum brakes

Your carb is a #4354, original application 1970 passenger cars with 225/automatic.

A: Bowl vent. The bowl vent is ducted to a tube instead of just open to the air. On '71-up cars ('70-up in California, e.g. this carb) the bowl vent was connected to a fuel vapor storage system (crankcase in '70-'71, charcoal canister in '72-up). Your '69 car has no such storage system, so just leave this fitting open and connected to nothing.

B: PCV fitting, correct. It was moved to the passenger side of the carburetor on Holley 1920 carbs in 1970.

C: Not an air bleed screw, but close. It's the idle mixture adjustment screw. As long as your previous carburetor was a Holley 1920, then the swap should be OK.

D: Vacuum supply for thermostatic air cleaner, which your '69 does not have. Cap it.

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