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Discussion Starter #1
What is the difference between a Holley 5220 carb and a 6520 carb, bath were used on our car from what I have noticed.
 

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Discussion Starter #3
Ok, I have an 83 shelby that is missing the original carb, but I found a carb off an 84, or 85. Would it work, or would I have to add a bunch of parts.
 

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Ok, I have an 83 shelby that is missing the original carb, but I found a carb off an 84, or 85. Would it work, or would I have to add a bunch of parts.
What carb did you find, a 5220 or 6520?

Are you in Calif or does your State require emissions testing?

Does your Shelby have AC or do you plan to disconnect it?

You probably won't need to add a bunch of parts and any carb would probably work. The question is how much better or worse...

My Rampage has the 5220 with AC. In 1983 it was considered a "truck" and did not have the stringent emission requirements as the passenger cars did unless it was sold in Calif. It does have the vapor canister & EGR valve which run off the vacuum ports on the front of the carb.

There are some posts here on TD that say the 5220 is better than the 6520.

A lot depends on the emissions you want to control or not...
 

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Discussion Starter #5
We don't have emissions checks. Most of the emission hardware had been removed in the past along with the o2 sensor, which could reinstalled. My car has AC and cruise and I want that to work. From what the parts store said on the numbers on the carb it is a 6520. The EGR and vapor canister are still present, but not attached to anything. The car has some sort of Holley on it now, but I don't like the way it acts and the stock air cleaner won't fit it. I'm a Neon person, so all of this is new to me.
 

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We don't have emissions checks. Most of the emission hardware had been removed in the past along with the o2 sensor, which could reinstalled. My car has AC and cruise and I want that to work. From what the parts store said on the numbers on the carb it is a 6520. The EGR and vapor canister are still present, but not attached to anything. The car has some sort of Holley on it now, but I don't like the way it acts and the stock air cleaner won't fit it. I'm a Neon person, so all of this is new to me.
If you go with the 6520 then you'll need the O2 sensor since the carb receives feedback from it. Make sure the carb has a "Wide Open Throttle Cut-out Switch" as that controls the AC clutch circuit (sort of a metal plate with an actuator that's mounted below the fuel inlet on the carb).

The Cruise Control cable should just hook up to the carb's linkage.

The EGR valve probably will need to be cleaned/replaced. From a front view there should be 2 vacuum valves that are mounted on the thermostat housing on the head. One of these control the EGR & Canister purge. Vacuum hoses are hooked up to these and to the carb, EGR & Vapor Canister Purge Valve (on top of the canister). The other controls the Air/Smog Pump on the side of the head that you said was removed. You should have a Vacuum Routing label in the engine bay...

If you haven't yet done already, invest in some service manuals (2 books): https://www.ebay.com/itm/1983-Chrysler-Dodge-Plymouth-Service-Manual-Chassis-and-Body-Supplement/254190220816?fits=Year:1983|Make:Dodge&hash=item3b2eeaf610:g:o1kAAOSw9xJcA-oy

If you go with a 5220 carb then no O2 sensor will be needed. The O2 sensor is mounted on the exhaust manifold and it might be a big PITA to remove the plug. Let's hope the PO put some anti-seize on the threads!

Also, a warning about the air filter housing. Be extra careful and do not over tighten the 2 wingnuts where the housing attaches on top of the carb!!! This could warp the upper part (air horn) of the carb!

There're some pics of my engine & rebuilt 5220 carb in my Album...

Hope this info helps and hasn't made things more confusing! :smile2:
 

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Discussion Starter #7
I have factory service manuals bought, if they ever get here. The 6520 that I bought has everything on it, even the ac cut out switch. How many o2 sensors were there? There was one in the convertor that I removed, is there one in the manifold also? Before I do anything I'm gonna test the mixture synoild to see if it even works. I also don't know if the computer still works, or not. All things considered, which carb gives less trouble and works the best? I'm still thinking, would I be better off just getting a Weber? And who would I make the linkage work?
 

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I have factory service manuals bought, if they ever get here. The 6520 that I bought has everything on it, even the ac cut out switch. How many o2 sensors were there? There was one in the convertor that I removed, is there one in the manifold also? Before I do anything I'm gonna test the mixture synoild to see if it even works. I also don't know if the computer still works, or not. All things considered, which carb gives less trouble and works the best? I'm still thinking, would I be better off just getting a Weber? And who would I make the linkage work?
There is only one O2 sensor on the '83 and it should be located on the exhaust manifold, driver's side. Look at the end of the manifold right before it attaches to the catalytic pipe. You should see the O2 sensor (My Rampage has a plug). The stock catalytic converter has no O2 sensor, just a tube that connects with a hose to the Air/Smog Pump. Maybe you have an after market cat. converter???

If the O2 sensor is upstream on the cat then it should work.

If you're going to use the 6520 you'll have to use an O2 sensor since it's a feedback carb.

If you use a 5220 then no O2 sensor to worry about. Opinions in other threads is that the 5220 works better than the 6520.

Yes, you could get a Weber but you'll have to research (check other threads) on how to hook up the linkage.

How about a 5220 carb, ditch the cat and run straight pipe from the manifold to the muffler since emissions aren't an issue. Maybe the Performance Experts here can weigh in on this...
 

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it also depends on if you are going for 'originality' of course ..

I'd say a properly running Holley 65xx 'feedback' carb is superior to a properly running 52xx ..
mainly cuz it should give a bit better fuel economy and mid-throttle power.
as the ECM (should be) managing A/F ..

but of course you need the proper ECM, original wiring in engine harness (ie not cut off/out), supporting sensors like O2 ..
 

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it also depends on if you are going for 'originality' of course ..

I'd say a properly running Holley 65xx 'feedback' carb is superior to a properly running 52xx ..
mainly cuz it should give a bit better fuel economy and mid-throttle power.
as the ECM (should be) managing A/F ..

but of course you need the proper ECM, original wiring in engine harness (ie not cut off/out), supporting sensors like O2 ..
Several options to choose from...

Since the 6520 is already in hand then maybe go with that. I agree that it would give better fuel economy since the carb would be monitored with input from the O2 sensor.

But yes, all the proper components need to be there. Just what is trying to be achieved???
 

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Discussion Starter #12
I'm wanting to be able to run the stock airbox and have a engine that is reliable and runs good. This car is really, really nice other than this stuff missing. It has a bigger than stock Holley and none of the original stuff works with it. I have the airbox and air hose and they look brand new, so I think they should be on it. I just got the car and I think this is what it needs, maybe later in a few years, I'll think about something else, like fuel injection. I don't mind changing things, as long as they look like the factory did it.
 

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I'm wanting to be able to run the stock airbox and have a engine that is reliable and runs good. This car is really, really nice other than this stuff missing. It has a bigger than stock Holley and none of the original stuff works with it. I have the airbox and air hose and they look brand new, so I think they should be on it. I just got the car and I think this is what it needs, maybe later in a few years, I'll think about something else, like fuel injection. I don't mind changing things, as long as they look like the factory did it.
Alright, very good!
Stay with the 6520 then. You said the Cat has the O2 sensor? Have you had a chance to look on the exhaust manifold? Might be better that the O2 sensor is on the Cat as long it is upstream. A lot easier to replace if needed.

Once you get your FSMs things should be easier. Have you downloaded the Efiche Parts Manual? The part numbers & diagrams will be very helpful! :smile2:

Post some pics!
 

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I had the cat removed cause it was falling apart inside and replaced it with a resonator.
Ahh oh then.

Look at this pic of an upside exhaust manifold. The O2 sensor (silver) is by the end where the donut seal goes. The EGR is at the bottom coming off the side...

See what's on your manifold.

(Sorry pic is so small)
 

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I had the cat removed cause it was falling apart inside and replaced it with a resonator.
PUBLIC SERVICE ANNOUNCEMENT
This only pertains to vehicles that are Registered, Street Legal and Driven on an Almost Daily Basis.
It does not pertain to Race Cars or Off Road Vehicles
Do not take any offense to what I am about to say...
This is one of my pet peeves so I am going to "Preach" because I am Old, emissions are a serious concern (Doing what I can to leave a functioning earth to my Grandchildren) and because I can because I am Old, or did I say that already?

I do not know where you live but I hate to see people get in trouble when they do not need to, removing/eliminating a Cat is a Serious Federal Offense and depending where you live is a State violation as well.

Even though I am exempt from state inspection in N.J. they still use random roadside inspection with mobile inspection units in conjunction with the local police, inspection or not the law states "you are responsible for maintaining a properly functioning (which includes emissions tampering), safe vehicle and you can be subject to fines/impounding if your vehicle is found to be in violation".

Also, when I was in training with Chrysler for a refresher course on engine and engine performance they had two Jeeps on dyno's one with a cat and one without to expel the myth that a cat is restrictive and creates excessive backpressure with a loss of horsepower.
Both vehicles had the same exact backpressure, removing the cat did not gain anything unless you count higher CO, Hydrocarbons and NOx emissions as gaining something.

My original Cat fell apart about 10 years ago, I replaced it and when that one rotted away about a year ago and I could not get a direct fit replacement I installed a Universal Cat that is legal in N.J.

I know, everybody says the same thing, they won't catch me, the police never bother me/they do not care, I will not get in trouble or I will replace it if I get caught...
My motto...
It only takes one time and one time is one time too many.

I do not wish to debate this.
I am done venting, Carry On.
 

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PUBLIC SERVICE ANNOUNCEMENT
This only pertains to vehicles that are Registered, Street Legal and Driven on an Almost Daily Basis.
It does not pertain to Race Cars or Off Road Vehicles
Do not take any offense to what I am about to say...
This is one of my pet peeves so I am going to "Preach" because I am Old, emissions are a serious concern (Doing what I can to leave a functioning earth to my Grandchildren) and because I can because I am Old, or did I say that already?

I do not know where you live but I hate to see people get in trouble when they do not need to, removing/eliminating a Cat is a Serious Federal Offense and depending where you live is a State violation as well.

Even though I am exempt from state inspection in N.J. they still use random roadside inspection with mobile inspection units in conjunction with the local police, inspection or not the law states "you are responsible for maintaining a properly functioning (which includes emissions tampering), safe vehicle and you can be subject to fines/impounding if your vehicle is found to be in violation".

Also, when I was in training with Chrysler for a refresher course on engine and engine performance they had two Jeeps on dyno's one with a cat and one without to expel the myth that a cat is restrictive and creates excessive backpressure with a loss of horsepower.
Both vehicles had the same exact backpressure, removing the cat did not gain anything unless you count higher CO, Hydrocarbons and NOx emissions as gaining something.

My original Cat fell apart about 10 years ago, I replaced it and when that one rotted away about a year ago and I could not get a direct fit replacement I installed a Universal Cat that is legal in N.J.

I know, everybody says the same thing, they won't catch me, the police never bother me/they do not care, I will not get in trouble or I will replace it if I get caught...
My motto...
It only takes one time and one time is one time too many.

I do not wish to debate this.
I am done venting, Carry On.
Well, you're absolutely correct NAJ.

Wow a Fed Offense? Didn't know.

We do need to take care of this planet even in the slightest way. I live in a area with few houses and mainly woods, pastures & a hay field or 2. Walk 1 1/2 miles every day and take a plastic grocery sack with me. It's a rare day when I don't pick up fast-food trash, beer cans or water bottles leaving it "presteen" as one local bubba calls it.

Seems we don't care about the environment anymore. Guess we're too self-centered & entitled now...

Now I'm done venting also!
 

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Well, you're absolutely correct NAJ.

Wow a Fed Offense? Didn't know.

We do need to take care of this planet even in the slightest way. I live in a area with few houses and mainly woods, pastures & a hay field or 2. Walk 1 1/2 miles every day and take a plastic grocery sack with me. It's a rare day when I don't pick up fast-food trash, beer cans or water bottles leaving it "presteen" as one local bubba calls it.

Seems we don't care about the environment anymore. Guess we're too self-centered & entitled now...

Now I'm done venting also!
https://www.epa.gov/sites/production/files/documents/exhsysrepair.pdf
 

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Discussion Starter #20
NAJ, You need a life. If you're so worried about the air, then you need to have your car crushed, cause it sure doesn't meet todays standards. I have never removed a WORKING converter, I just bought this car and am trying to get it sorted out. This cat was not doing anything except maybe making things worse by clogging up the system. I also could also just leave the great big Holley on it that doesn't belong there, why didn't you say anything about that? I'm trying to get it BACK to the way it should be, and that takes time. I'm well aware what the law is on converters, but I'm doing what I can as I can. If you're so worried about it go after the real polluters, like all the electric cars. Have you said the same thing to everybody that has changed cams, up'ed their boost, or hot rodded their engine in any way?
John, I'm sorry you got caught up in this, you were just trying to help.
 
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