How much for 71 Thermoquad?

fratzog lover

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Back in early 1980 I had an Autolite 4300 spreadbore I aquired from someone who was "upgrading" to a Holley. I think I sold it for $65. Did I just earn Dummy of the Year?
 

Mopar383519

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Good day....any 71 tq were swapped because service tech did not have a handle on them, and Ma Mopar did not want to waste time with the techs on the learning curve.

71 fuel bowls are the best as fhey do not have the leaky fuel wells.

At this point in time, ANY tq core will need full attention and 95% chance of installing throttle shaft bore bushings.

72 6138/6139 carbs are getting pricey too now.

Both carbs run well once YOU understand them and YOU do the final adjustments for YOUR combination. Just like ANY other carb.

If you EFI quality like tuning...go EFI!

A 273 is not like the torque monster of a 440...right?
Why try to tune a carb to matc h EFI ? ( unless you know the carb intimately).

My vote is...longivity....71
Save $...72
Not numbers or class raced....any 72 to 74 tq.

Comp and 71's for me.
 

Mopar383519

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These

Screenshot_20220918-112342_Samsung Internet.jpg


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GTX JOHN

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Idle Air Bleed are pointed outward om 71's

All the later 72 up are pointed straight forward.

You can see that 5 ft. away at the Swap Meet!
 

Bewy

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Post #28.
Nope, reason they were dropped had nothing to do with techs 'not having a handle on them'.
The later 1972 fuel metered design made it easier to control emissions. The 1971 is actually a simpler design....than the later models. Schoolboy could work on them.
 

RustyRatRod

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How can ya tell if ya have a 71 model? I have one laying around somewhere ,leaked raw fuel into my engine so it got nixxed for an Edelbrock...
The 71 carburetors have angled air screws, not straight.
 

Mopar383519

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Yes, I agree 72 production engine had the new design for emissions.
If an owner of a 71 had any issues, the TECH SERVICE BULETIN told techs to automatically swap to a 72 model carb.
Thus my comment about techs not getting a handle on them....they never got the chance too...
 

EL5DEMON340

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sold a few 71's off several years ago, after taking the best parts off of those and using them on the one sitting on my shelf, also ws lucky enough to find a jet kit for it
 

GTX JOHN

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If you watch our Video from last week at the
World Final in Racer Section = You will see a
71 on our Demon.
 

ch1ll

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Thinking that most folks 30 or so younger have never owned a carb or a carbureted car, much less even rode in one, how would they weigh or argue the difference to EFI?

The only difference between the two I can tell is the way the car starts immediately, a few mpg overall and you don’t tune efi with a screwdriver or need to carry one in your glove box.

I had a couple late 80’s pickups with efi, boy I’ll tell you, efi has changed from carb like reliability to awesome. The real shame is aftermarket efi all seems to have puke monster CHINESE eletronics/computers. You would think direct connection and mopar performance in the past would/should and could have brought to market a reliable performance oriented EFI system with oem reliability.
 

Brooks James

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It's rare, but if it's missing parts....the 71 is an air metered carburetor. 72 and up were fuel metered. Chrysler replaced a crapton of those carburetors under service bulletins. That should tell you something. I wouldn't have one. Pain in the *** to tune....as if they're not already. But if you're a glutton for punishment, go for it.
71 push in Jets are rare as hen's teeth
 

Bewy

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I have two 850 CS TQs with press in jets. I fitted some coil springs over the jets that pressed against the black body to make sure the jets did not fall out...& they never did.
 

Hysteric

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The later 1972 fuel metered design made it easier to control emissions. The 1971 is actually a simpler design....than the later models. Schoolboy could work on them.
The 72 design is far superior to the air bled version. The fuel delivery is more linear with a solid fuel carb versus the emulsion design that is a compromise at best.
 

Hysteric

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850 v 850
You could bolt on 10 different 850's and one might make more power than the other 9 because its particular calibration is better suited to that engine so it the must be the better carb of the 10 yeah..........

The real question is why you think emulsion is superior to solid fuel metering.
 
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H22A4

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Regardless of the part, the asking price depends on how serious the seller is in wanting to sell the part and how badly the buyer wants it. Have you seen some of the prices members are asking here in the classifieds for other parts?

A set of 340/360 A body exhaust manifolds (not the earlier hi-po ones) for $850

A 340 air intake pie tin (just the pie tin) for $350 or $300?
 

fratzog lover

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Regardless of the part, the asking price depends on how serious the seller is in wanting to sell the part and how badly the buyer wants it. Have you seen some of the prices members are asking here in the classifieds for other parts?

A set of 340/360 A body exhaust manifolds (not the earlier hi-po ones) for $850

A 340 air intake pie tin (just the pie tin) for $350 oI agree. And most parts are not even cleaned. If you really want to sell it...My 0.02.
I agree. Many parts arent even given a basic cleaning before being listed...my 0.02.
 

toolmanmike

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Regardless of the part, the asking price depends on how serious the seller is in wanting to sell the part and how badly the buyer wants it. Have you seen some of the prices members are asking here in the classifieds for other parts?

A set of 340/360 A body exhaust manifolds (not the earlier hi-po ones) for $850

A 340 air intake pie tin (just the pie tin) for $350 or $300?
Yep. I just shake my head and scroll on by. I think those are still for sale.
 

Bewy

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Hysteric,
Post #45. There are two aspects to superior metering of these carbs, so one at a time.

[1] You are the one making the claim that 72 & up has superior metering. How/why? I do not know. I have read the same info you have which are just claims, never seen any testing or comparisons. What does superior mean? Better mileage, more power? Other?
[2] The 71 TQ uses the same dump tubes in the secondaries that the CSTQ used [ like a QJ ].
The 72 & later used dump tubes that have a rounded, closed of bullet shaped tip with a small hole in the end. There are a few holes along the length of the tubes that vary in size, position & number. Despite my best efforts, I have not been able to find how the size, position & number of these holes was arrived at. They vary depending on which engine the carb is used. Chry carefully calibrated these carbs for each engine. Obviously if the manifold is swapped or any other deviation from stock, all bets are off regarding accurate 'superior' metering....& the original, single outlet, design is likely to be better.
 
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