Thermoquad tuning on 318

Bewy said
The secondaries bog is not always due to the AV spring adjustment......which is why adjusting it does not cure the bog. Logic should tell you that if the factory AV tension is not enough on a stock engine...& this is a stock engine.....then something else is wrong.
Causes of the bog can be:
- AV fully open position incorrect
- & for the 3rd time in this thread: faulty dashpot. The d/pot rubber diaphragms go hard over time & make the d/pot slow to release. Very hard to pick by looking at the d/pot. That is why the test in post #28 will determine if it is a d/pot problem.
A slow to release d/pot creates a rich bog. The AV hangs in the closed position, acting like a choke.

Lets cut to the chase here. Stock 318 with 72 340 TQ intake and supposedly stock 72 340 automatic TQ. The carb and intake should work perfectly in this application. Stock 6139s air valve adjustment is 1 turn. This assumes an original, complete, unmolested 6139s carb and choke. Not a fan of throwing parts at something. That is why I ask for pictures. You might be right. You might be wrong. He could have a Frankenstein carb with a 6139s base plate and a newer top plate, who knows what bowl, and missing or mismatched linkage.