ThermoQuad info and kit question

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midnight340

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Just bought FIVE ThermoQuad builders for $50- as I am wanting to try a TQ on my 340.
So here's what I have:

6518S this an 850 and is the cleanest which I hope to rebuild and use. According to the list. I have this is listed and a "440 Chrysler Industrial" and I have no info on rods/jets in it till I take it apart.

6322: This one is in pieces with rods and some linkage missing. (also an 850)

6319S: This is listed as a ('73?) 340 Auto carb. 1-3/8" smaller primaries. Seems complete.

9130S: Which is not on my list. Anyone know what this is? (small primary)

9207S: This is listed as a '79 360 truck carb. (also small primary 800)

My main question at this time is who makes the best rebuilt kits for these????

I have amassed most of the available info on these and have rebuilt other carbs so am fairly comfortable going into this. I have been wanting to learn about these for a while. Had one on a stock 440 I installed in a '56 Plymouth Savoy 2-dr post. (Loved the way that ran, and the sound!!)
 
Keep and build the 6139 and sell the rest. That one was made for a 340. I’ve got a really nice one I’ve been saving to use on mine.

Good luck, I’m sure TQ masters will chime in.

Jake
 
There was just a post the other day about a good kit. Give me a minute.
 
I ordered one of the walker kits because of that thread. I couldn't see any particular advantage to that kit just looking at the contents. It looked the same as a Hygrade/Standard kit that I have been using for decades, to me. Judging from the online pics of the kit contents, I was hoping it came with the reusable base gasket, but it came with regular crush type gasket that most kits do nowadays.
 
Thanks for the kit comments.

A few more questions:
As far as which carb to use, I’ve always heard that a 340 really works well with the 440 (larger primary) 850 carb. What experience have some of you had in this regard?

What are the opinions on using an adapter on a LD340 intake?

When I get started what carb cleaners work best??
Will carb cleaners damage the phenolic resin body??

If I need to redo the epoxy on the wells what should I use? I read mixed opinions on JB Weld.
 
do not soak plastic bowl. I believe that's what kills the adhesive on those well caps. Soaking the bowl for extended periods in harsh chemicals eats up the smooth finish on those bowls, and it is TOTALLY unnecessary. I clean my tq bowls by hand with an old toothbrush and solvent cut with ATF. Replacement bowls, if you can still get your particular bowl, are nearly $200, no soaking is necessary for the bowls.
I don't think jb weld will last on the well caps.
be careful soaking the cast base and top, too. If you let it sit in it too long, it will take the Teflon coating off of the throttle shafts, and it will take the (gold) cad plating off of the plated linkage parts, too.
 
do not soak plastic bowl. I believe that's what kills the adhesive on those well caps. Soaking the bowl for extended periods in harsh chemicals eats up the smooth finish on those bowls, and it is TOTALLY unnecessary. I clean my tq bowls by hand with an old toothbrush and solvent cut with ATF. Replacement bowls, if you can still get your particular bowl, are nearly $200, no soaking is necessary for the bowls.
I don't think jb weld will last on the well caps.
be careful soaking the cast base and top, too. If you let it sit in it too long, it will take the Teflon coating off of the throttle shafts, and it will take the (gold) cad plating off of the plated linkage parts, too.

OK, thanks. I appreciate the guidance, I’m OK going slow and taking time with this. These are mostly covered with dust and shelf grime. It looks like someone was careful to set aside cleaner or less used carbs.
 
The Walker kits all come with ethanol friendly rubber parts, like the fuel well seals. That's the difference.
 
I am also rebuilding a TQ-a 6139S. I’m new @ these carbs so I bought the SA how to book on Carter/Edelbrocks. I’m using a Walkerkit #15543. It is missing the round rubber gasket for the idle compensator valve. In fact, the parts breakdown in the rebuild kit does not even show the idle compensator valve. Fortunately the diagram in the SA book does show it: part #58 in the picture on page 133. The idle compensator valve has the numbers 32329 stamped on it. Also, I destroyed the leather bladder seal on the accelerator pump(plunger assembly) while trying to remove it to install the new one that came in the kit. The new one doesn’t seem to have a large enough OD to seal properly in the bore. Anyone ever run into either of these problems? Any help is much appreciated! Thanks, Tom
 
I am also rebuilding a TQ-a 6139S. I’m new @ these carbs so I bought the SA how to book on Carter/Edelbrocks. I’m using a Walkerkit #15543. It is missing the round rubber gasket for the idle compensator valve. In fact, the parts breakdown in the rebuild kit does not even show the idle compensator valve. Fortunately the diagram in the SA book does show it: part #58 in the picture on page 133. The idle compensator valve has the numbers 32329 stamped on it. Also, I destroyed the leather bladder seal on the accelerator pump(plunger assembly) while trying to remove it to install the new one that came in the kit. The new one doesn’t seem to have a large enough OD to seal properly in the bore. Anyone ever run into either of these problems? Any help is much appreciated! Thanks, Tom
I don't think I've ever seen a leather cup seal on a tq accelerator pump.
 
The new accelerator pump seal isn’t leather nor does it have the little coil expander inside the lip like the original. The new seal seems to be some sort of rubber or neoprene material but it isn’t a very tight fit.
 
So the pump is the solid brass one? I believe the supplied plunger will just fit the new design pump (steel/plastic) And it will not use the pal spring.
 
Ok, thank you for that info. Appreciate the help! Do you know anything about the idle compensator valve? I didn’t find a new rubber gasket for it in the Walker kit. The parts breakdown with the kit doesn’t even show it! I found a picture showing it in a parts breakdown in the book I bought (SA Carter/Edelbrock rebuilding)
 
Chrysler Tech The New 1972 Thermoquad (1972 Booklet)
1972 Imperial & Chrysler Thermo-Quad Carburetor Service Book (Session 290)
Filmstrip
1972 Thermo-Quad Carburetor, The Master Technician Service Conference Series 72-1

Carter Federal-Mogul Thermoquad Service Manual
6/82 form 3623A
Carter Thermo-Quad Service Manual

Save these to your computer - It seems the online imperial club may be at the end of its life. The mirror .org site is offline.

Also here (at FABO)
Gary Lewallen's "A Carter Thermoquad Guide"
pdf Typescript. c. 1998
https://www.forabodiesonly.com/mopar/attachments/a-carter-thermo-quad-guide-pdf.1714667249/


Another version of the same? in html format
A Carter Thermo-Quad Guide
 
Thank’s for the great info, Mattax! I appreciate the help. I’ve started reading the Chrysler thermoquad manual-a blast from the past-very cool. Hope I’all be a little more knowledgeable about them after studying this stuff!
 
Chrysler Tech The New 1972 Thermoquad (1972 Booklet)
1972 Imperial & Chrysler Thermo-Quad Carburetor Service Book (Session 290)
Filmstrip
1972 Thermo-Quad Carburetor, The Master Technician Service Conference Series 72-1

Carter Federal-Mogul Thermoquad Service Manual
6/82 form 3623A
Carter Thermo-Quad Service Manual

Save these to your computer - It seems the online imperial club may be at the end of its life. The mirror .org site is offline.

Also here (at FABO)
Gary Lewallen's "A Carter Thermoquad Guide"
pdf Typescript. c. 1998
https://www.forabodiesonly.com/mopar/attachments/a-carter-thermo-quad-guide-pdf.1714667249/


Another version of the same? in html format
A Carter Thermo-Quad Guide
good job citing those great resources.
 
Also in my original post I listed a 9130S but upon wire brushing the numbers I see it is a 9150S from a 1978 truck 440. I now have two decent complete 850 units plus a dismantled one for parts.
 
I have printed out all the information/books that Mattax suggested, plus have a new copy of the SA/Carter, Edelbrock book, so I now have plenty of info and guidance as to how to rebuild and adjust the ThermoQuads. And I appreciate the advice Rustycowll69 gave in regards to soaking parts.

But I hope for some response to these two questions:

1) Which carb is likely to work best on a hot street 340? 800 small primary, or the 850 large primary??

Anyone tried both on a 340??
I intended to build one of the 850 models, as my motor did not like the AVS2 650 (at the top end), really responds to my modified #1407 750 (primary bore 1.69")
and seems to really like a lot of carb when I get into the throttle. In looking up the specs on these, I find the 6319S model ('73 340 Auto) has bigger jets and smaller rod #'s than the 440 carbs, even though it has the smaller 1-3/8" primaries, so it is set up to supply more fuel than the 440 models.

2) Also, any comments on using an adapter on a LD340 intake??

I'll order a kit soon. I still have not stripped the #6518S (Chrysler Industrial 440) so do not know how it's set up. By condition, I'd like to build this one if all goes well.
 
Well I don't like adapters. I think an intake designed for a spreadbore should have better cylinder to cylinder distribution with a spreadbore on it, and same with a 'square bore.'
The LD340 with a t-quad on it was a bit of trick for racing in 'stock'. The back bores were opened up (carefully because the sealing surface then is greatly reduced), the divider cut down, and IIRC notches cut into the boosters to direct the fuel to the runners that would otherwise be shy.
 
Understand. I like my LD340 as I have it gasket matched to my ported X heads. I’ll give it some thought. Guess it would be possible to add some metal if necessary. My divider is already cut down some.

Otherwise, what’s a good manifold with a TQ?
 
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