Yet another Thermoquad question

[MNBiker]

So I am going to rebuild this one for use on my 68 383. Wondering what the vacuum thing is that is mounted in front of the top plate. Guessing something for emissions. Can it be blocked off?
Thanks

 

[artr8]

"Up front the later TQ’s featured a flat-faced boss on the airhorn. Carbs of this configuration were revised with an auxiliary air bleed circuit that affects the fuel mixture. On some carb variations, this front boss was left un-machined and blank, defeating the additional air bleed circuit. Chrysler used three variations of controls on this air bleed provision, most commonly a vacuum operated diaphragm that closed the air bleed to enrich the mixture during warm up. Some carbs added a high altitude compensator valve to the enrichment diaphragm assembly. Our carb is so equipped. Finally, later OEM TQ’s utilized a feedback solenoid here to electronically alter the metering via a primitive ECU feedback system." https://www.hotrod.com/articles/mopp-1304-rebuilding-a-carter-thermoquad-carburetor/

 

[rumblefish360]

Use an earlier year TQ. That is not the one you want. Make sure it is the large primary model.
View this thread; https://www.forabodiesonly.com/mopa...k-tq-tuning-tips-video-i-made-for-you.434235/

 

[idrivemopar]

What rumblefish said, plus, did you know the thermoquad wasn't introduced into production cars until 1971?

 

[383man]

Yes that's a Cold Idle Enrichment Valve. As was said. Ron

 

[MNBiker]

I understand an older one would be preferred. Can I make this one work?

 

[rumblefish360]

I understand an older one would be preferred. Can I make this one work?

Yes. You may not like the performance of it on a hopper up engine.

What rumblefish said, plus, did you know the thermoquad wasn't introduced into production cars until 1971?

FWIW. Did you know they were designed and used as a racing carb in the late 60’s?

 

[rumblefish360]

So I am going to rebuild this one for use on my 68 383. Wondering what the vacuum thing is that is mounted in front of the top plate. Guessing something for emissions. Can it be blocked off?
Thanks

Yes

 

[idrivemopar]

FWIW. Did you know they were designed and used as a racing carb in the late 60’s?

Yes, I did, although I have never seen one in person.

 

[oldkimmer]

Their a great carb when u get them set up right. It may take a lot of fiddling but is well worth it.yes u can make it work. Kim