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Thermoquad question #242347
03/03/09 08:39 PM
03/03/09 08:39 PM

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hey guys, came over from the slantsix.org site. Upsizing my B Body to a '72 340 automatic.

there is a thermoquad 9203s available on ebay. manual says that model was for a 79-80 345 auto/IHC


will this carb work well on my 340?

thanks so much for your input

Keni

Re: Thermoquad question #242348
03/03/09 08:51 PM
03/03/09 08:51 PM
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RapidRobert Offline
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welcome here. I'd contact demonsizzler on this site


live every 24 hour block of time like it's your last day on earth
Re: Thermoquad question [Re: RapidRobert] #242349
03/03/09 09:01 PM
03/03/09 09:01 PM
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i don't think you want that carb...you should try to get a 71 or 72 carb (pre-smog emissions) or try and hunt down a superquad (aftermarket TQ)- that's the route i was going to try, because of the electric choke feature, then you don't need the correct intake


'71 Satellite Sebring 440
Re: Thermoquad question [Re: landon1] #242350
03/03/09 09:56 PM
03/03/09 09:56 PM
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Manitoba, Canada
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If you want to find one you can rebuild yourself and run, find one of the 6000 series, ie the first number is a 6, the other 3 are anything else. The 9000 series are the smogger carbs, which would need some rejetting and other mods before being good to use.

The Vaanth Thermoquad Guide has all the numbers you need to see:

http://members.shaw.ca/crussel/thermoquad/tqguide.html

Re: Thermoquad question #242351
03/03/09 11:11 PM
03/03/09 11:11 PM
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Not2farfromNashville, TN
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That carb is for the International Harvester 345 engine. I may actually have one of those. It won't work linkage wise on a Mopar.

I'll be up early tomorrow. Give me a call.

BTW you don't want a '71 model 340 carb.


"The only thing to do for triumph of evil is for good men to do nothing"

"NUNQUAM NON PARATUS!"
Re: Thermoquad question [Re: Rug_Trucker] #242352
03/04/09 03:31 AM
03/04/09 03:31 AM
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ademon Offline
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Why not a 71 T-quad? thats what most of the F.A.S.T. 71 sb cars are running.

Re: Thermoquad question [Re: ademon] #242353
03/04/09 09:26 AM
03/04/09 09:26 AM
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Quote:

Why not a 71 T-quad? thats what most of the F.A.S.T. 71 sb cars are running.




They require different jets and metering rods. They are an air metered carb VS solid fuel. I think I saw repopped Strip Kits for them for $500

Do the FAST cars have to run #'s matching carbs?

Any year TQ can be made to scream. Even the 9000 series OE carbs.


"The only thing to do for triumph of evil is for good men to do nothing"

"NUNQUAM NON PARATUS!"
Re: Thermoquad question [Re: DaytonaTurbo] #242354
03/04/09 07:20 PM
03/04/09 07:20 PM
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Quote:

If you want to find one you can rebuild yourself and run, find one of the 6000 series, ie the first number is a 6, the other 3 are anything else. The 9000 series are the smogger carbs, which would need some rejetting and other mods before being good to use.

The Vaanth Thermoquad Guide has all the numbers you need to see:

http://members.shaw.ca/crussel/thermoquad/tqguide.html




Not all 9000 series carbs are "smogger carbs". I ran a #9023 on my built 340. I would recommend using a 72-74 TQ carb. A SB or BB TQ carb will work well on a 340. Just make sure it's jetted right for your application and has a good set of performance metering rods like 1966's.

You can get other TQ's to work well but someone like Demonsizzler would probably have to modify or tweak it.


1970 FE5 Duster 360/904/3.91's SOLD 1973 TB3 SpaceDuster 340/4spd/4.10's SOLD Moparless for now but when the opportunity is right I'll have another one.
Re: Thermoquad question [Re: MY340] #242355
03/04/09 07:26 PM
03/04/09 07:26 PM
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The FAST guys are running the special 2-3 year only Competition Series that looks like a 71 carb. The are expensive, rare, and not recommended for the street at all.

Re: Thermoquad question [Re: cdp] #242356
03/04/09 10:35 PM
03/04/09 10:35 PM
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71 carbs are not the way to go, hard to find, and backwards from 72 and up. 72 to 74 or 75 where the best because of the fuel inlet pos. and not all the add on emmision crap. the trap door is the secret to making these work right. there where to types, get the larger front barrels,440 cars, jury rig a choke and keep working with the rods and plunger springs, depends on the vacuum at idle,i.e. cam, good luck

Re: Thermoquad question [Re: cudaman1969] #242357
03/05/09 01:57 AM
03/05/09 01:57 AM
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Quote:



the trap door is the secret to making these work right.






The TRAP DOOR ? ... now that is a NEW TERM that most have not heard of !! .... Would that be the secondary air valve ? ... well do I have the TOOL for you ! ..... and it is new and improved from the OEM piece.

That is a major consideration ... but there is a little more to be concerned with than just that.

Re: Thermoquad question [Re: cdp] #242358
03/05/09 10:17 AM
03/05/09 10:17 AM
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Quote:

The FAST guys are running the special 2-3 year only Competition Series that looks like a 71 carb. The are expensive, rare, and not recommended for the street at all.




Really??

The Comp series TQ's are not legal for F.A.S.T. and if I remember correctly has some pretty significant visual differences too.

Come to think of it, there are very few of us TQ racers.

For the record I'm running a 1973 spec TQ that was remanned by Holley that I bought from Summit.


2017 Contusion Blue Challenger T/A 392 M6 "BLKNBLU"
Re: Thermoquad question [Re: CJK440] #242359
03/05/09 10:24 AM
03/05/09 10:24 AM
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ScottSmith_Harms Offline
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Quote:

Really??

The Comp series TQ's are not legal for F.A.S.T. and if I remember correctly has some pretty significant visual differences too.





Right, I haven't heard that one either.

But in thinking about it, I do see guys running different TQ part#'s other than what's production line correct for thier cars and nobody seems to give them any flack over it, I don't see why they couldn't use a Comp carb just as easily?

They do have some obvious differences, but most aren't visible with the air cleaner on, where do you draw the line when NEITHER carb is correct?


Re: Thermoquad question [Re: ScottSmith_Harms] #242360
03/05/09 10:31 AM
03/05/09 10:31 AM
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The numbers don't matter in FAST. A 73 340 TQ can be put on a 72 340 car.


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Re: Thermoquad question [Re: CJK440] #242361
03/05/09 10:44 AM
03/05/09 10:44 AM
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ScottSmith_Harms Offline
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Right, but it goes beyond the numbers. A 72 TQ carb doesn't look like a 71 TQ carb, so what's the difference if a comp TQ also looks different as well? Again, where do you draw the line?

Re: Thermoquad question [Re: ScottSmith_Harms] #242362
03/05/09 11:09 AM
03/05/09 11:09 AM
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I do agree there is some gray area with the way the FAST rules read.

When we revised the rules for Supercars we opened up the carb rule to eliminate confusion. You can run any carb as long as it appears externally similar as the OE peice.

To meet FAST rules I had to take an 800 TQ and machine it to accept 850 throttle plates.

In Supercars I could just go find a similar appearing 850 and plop it on.

The good news for Mopar guys is the cars that left the factory with a 625 with a little cosmetic work, can take advantage of Edelbrocks line of larger AFB's and AVS's and be competitive now in this series.


2017 Contusion Blue Challenger T/A 392 M6 "BLKNBLU"
Re: Thermoquad question [Re: CJK440] #242363
03/05/09 11:12 AM
03/05/09 11:12 AM
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That's my point, that "Gray area" needs some futher work IMO, you can spend allot of money guessing one what you can or can't run. I can make an 850 Comp series TQ look ALLOT like a 71 street version with a little work, only a knowledgable Mopar guy could pick up the differences, and that's only if he's paying attention really close.

So would it be legal?

Re: Thermoquad question #242364
03/08/09 10:40 PM
03/08/09 10:40 PM

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"If you want to find one you can rebuild yourself and run, find one of the 6000 series, ie the first number is a 6, the other 3 are anything else....
The Vaanth Thermoquad Guide has all the numbers you need to see:"

OK with TQ guide in hand here's what i have found
that I think would work:

-6139S is for a '72 340 automatic
(needs a rebuild).
-6324 is for a 73 HP 440 automatic (newly rebuilt)
-6090 for a 72 400 auto (newly rebuilt)
**4968 Carter AVS for a 71 HP440 auto (newly rebuilt)

will any of these other carbs work well on my 340 ? Will a carb for a 440 HP be too much?

sure appreciate all your feedback. I could talk all day about slant sixs and super sixs. But this muscle world is all new to me!

Keni

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Re: Thermoquad question #242365
03/09/09 02:04 PM
03/09/09 02:04 PM
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I rebuilt a 6139S for my '73 340, and I have had to re-work it due to the aggressive cam. It was running lean, I have since added #1966 metering rods and a lighter tree spring. Thanks to Demonsizzler (on this site) it is almost there, (it need jets now) but I wish I had done better homework beforehand. Live and learn. But was it worth it? Yes! It is easily the scariest engine I have rebuilt, it just runs and sounds so nasty, and the TQ is extremely responsive. Ask Demonsizzler his advice on which of the above carbs to use.

Re: Thermoquad question [Re: 4BBodies] #242366
03/09/09 02:05 PM
03/09/09 02:05 PM
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Scary = Fun

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