V8 Pcv And Power Brake Booster Ports

Hello all,
I am doing some odd jobs on the rebuild project while the weather is not too great and got to looking at my carb setup and vacuum ports. My jeep has a 360, has factory power brakes. When I go to hook things back up, do you think it will make a difference what ports on the rear of the carb and adapter plate are used for pcv and brake booster?
It appears to me that when they are assembled together, both rear facing ports are full manifold vacuum.
My carb is the original (as far as I know) 2100 with a rear facing vac port, maybe 3/8" OD. The same for the aluminum adapter plate to mount the carb to the manifold. My jeep had some other type of carb attached when I bought and if I remember right the pcv was connected to the adapter plate. The carb that was on it was a 2150 I think and it didn't have a rear facing port. The brake booster was just unhooked. The weren't any other ports on the manifold that looked like they were used for the booster, although my engine came out of a 1972 wagoneer and was probably an automatic, no guess for how it was done on the wagoneer.
I did some searching and didn't find a picture of a 73 with a V8 and power brakes that showed the original configuration. Thanks for any thoughts. I can get a picture posted of the carb and adapter plate if needed.

 

I will go take a photo of mine. BRB

 

There should be full manifold vacuum port available on the front center of the intake, Would this work for your PB attachment point?

 

I would hook the PCV to the carb base. The brake booster can go to any intake manifold vacuum port.

 

Here's a picture of my carb and adapter, both have rear facing ports. I am fairly certain they would both be full manifold vacuum. Figured I might as well use both of them unless there's a certain reason that it won't work?

 

That should work, but I'd take a close look at the base or the carb and compare it to that adapter. I don't think those were made to go together. It'll obviously bolt up but you might have a vacuum leak.

 

Yea I will make sure they match up good before I use them together. Along those lines. did AMC have a manifold where the carb would bolt directly to it, or did they all use some sort of adapter? Talking about the 2 barrel or course.
My manifold doesn't have any holes out on the corners where the carb would bolt to, it will only mount with the adapter plate. Just wondered it that was normal or an oddity. I know there was a lot of variables in the early 70's. My engine is from a 72 Wagoneer.

 

Actually i should have looked before I asked. I found some pictures of 2 barrel manifolds that had holes further out for a direct cab install. Not sure what years they did that but it would explain why there was some issue with my use of the adapter plate, mine needs it for carb install. Thanks for the replies.

 

post pic of intake manifold without carb

 

Something is not right there, there should be a spacer between carb and intake and all the bolts should line up, carb, spacer and intake with the 2100 carb base.

 

This is a picture of my setup. The recessed holes mount to the manifold and of course the carb bolts to the studs on the adapter and I end up with two rear facing vacuum ports.
This is how it was when I bought it, of course the engine was from a Wagoneer (72) and it's hard to say what options it may have had, power brakes, etc.
I'm not sure what parts where taken from the Wagoneer and moved over the CJ5, the carb has the right part number for my year of jeep, 3DM2, which matches the service manual. If I was to guess, I would think the intake is 1972 Wagoneer, the carb maybe got reused from the CJ5, however I think they were the same setup?

I'm having issues trying to load the picture. I will try again after a while.

 

Nope not mine. I have to use the adapter plate. It's P/N is 3197877. It's an AMC part because I bought a spare one from ebay a few years ago.
I will try to get a picture loaded once I figure out why they won't download. I reduced it way down but it says it's too big?

 

Strange,,. Wonder if maybe yours is a special setup for Calif emission vehicle.

 

I don't think so, they guy I bought it from said it came from a Jeep dealer in Manhattan KS, it was in the family for years. I read on another forum that some of the 71-72 Javelins used the same adapter plate, maybe my engine wasn't from a Wagoneer like he thought.

 

Has to be smaller than 1MB. Or, hosted on a photo sharing site.

 

After doing some reading on a variety of AMC forums, I might know what the story is, possibly.
In the early 70's AMC used the adapter plate to hook the up the pcv because the 2100 carb didn't have a rear facing port. Around 73-ish, they acquired the 2100 carb with a rear facing port, no longer needing the adapter plate, the manifold bolt holes were moved further out to match the 2100 carb.
If you mix the years up as mine is now, you get two rear facing ports. Also after reading more about the brake booster connection, it sounds like it works best if it's out on it's own port on the manifold, as you all have suggested. I will just cap off the plug on rear of the carb. I'm still learning on these AMC's, any other info would be interesting. Thanks for the help.

 

Late...But...I've got factory power brakes, the booster goes directly into the Intake manifold vac source. That source is a big two port plug, directly center of the carb, half way between carb and front of manifold. Screwed into manifold directly. Get the TSM, go to page 4A-24. They have pic of it. One feeds the Booster, one feeds the Spark CTO.

You can sort of make it out on this pic. Spaghetti. But follow the biggest vac. line down from booster. it ends in a blue thing. zoom in. It is just underneath the fuel line metal to rubber connector. It's hard to see. but that is the right vac. In the second pic. you can see it without the spaghetti. its right between carb lift plate and water Therm housing. Zoom in.

 

Nice touch, those cowl-mounted instruments. Oil pressure, coolant temp, and what? Manifold vacuum?

 

Chris, will you STOP posting pics of your jeep.!!!!

I drool and slobber way too much every time I see that beauty.

 

Excellent pictures, that helps a lot, thanks.