I believe the 6322 is a 1973 TQ for a 440 (and rated at 850cfm). That being said, would there be any downside to parking it on top of a 340? I think oversizing with an 850cfm in place of an 800cfm would be just fine... and far better than under-sizing the other way. Any thoughts?
Run it. Tuning parts for the TQ are very hard to find. Ether purchase junk cores for super cheap to raid them for there rods and jets or become creative and make your own rod holder for AFB rods cut 3/4 of an inch shorter.
Too big, but I don't see why you couldn't run it on a 340
Later year 340’s, IIRC, use the larger TQ. The 360 also used the large TQ on a lower/less powerful engine output. The extra 20 cubic inches is not the make or break point.
One thing about Thermoquads depending on what motor they came on there is a tab on the secondary air door that you can bend to adjust how far the air door will open so in effect it adjusts the size of the carb so you should be able to make the carb work assuming that you can find metering rods and etc. if needed to be able to adjust it for the motor.
Just to be clear.....
Do not bend the tab that stops the secondary top air door flap but bend the air door itself. There is a cut in the metal to bend the top portion of the flap, as viewed when open. The amount of air flow restricted is very minor as is the tuning effect it has on the overall AF ratio.
Just curious as to where you are getting the 850 cfm number?
These cfm ratings are the accepted air flow rates by the people at large. These are not accurate. There is a thread on FABO, that has actual flow rates of the TQ’s. Where this fella came up with these flow rates is an unknown but are much more believe able in there CFM amounts.
I find that information later.
https://www.hotrod.com/articles/mopp-1304-rebuilding-a-carter-thermoquad-carburetor/#:~:text=Wide-open, the "small,as a high performance carb.
"Configured with either 138 or 112-inch primaries and massive 214-inch secondaries, the TQ delivered enormous airflow. Wide-open, the "small" TQ was rated at 800 cfm, while the larger unit spec'd at 850 cfm"
Paragraph above... ^^^^^
Just to be clear... 1.38 & 1.50 (1-1/2) & 2.25 (2-1/4)
Will it run worse?
No, it won’t, but the jetting is off, which is IMO, 100%, a fact it will be, which can be corrected. Once corrected, it will run better, stronger, faster than the smaller TQ. A stock 340 will swallow the big TQ just fine.
Here is a way to look at it. The stock 340-4 bbl came from the factory with a small Carter carb. Look at the size of the carb and venturi’s. Now compare against the Holley. The normal go to “Hop Up” carb, other than a Holley, was the larger Carter carb rated at 750, found on performance 440’s. The engine has always responded favorably. Compare venturi’s again against the Holley.
If a TQ of the people’s rated 850 is to large, then explain the 6 pack set up rated at 955 CFM when converted from its 2bbl rating of 1350 CFM.
