Thermoquad 1966 Metering Rods

Quick,
You cannot judge the carb just by jetting alone. The earlier 6000 series carbs that I have seen had smaller primary high speed air bleeds. They are easily seen with m/rod inspection covers removed; they are a brass insert, next to the side wall of the choke tower, near the inspection cover screw hole. Later carbs had larger air bleeds & used the larger 101 pri jet. A side by side comparison is easy to see. Larger air bleeds lean the mixture, so I assume the larger jets were used to compensate for this. Not sure why the change, probably emissions related.

Similarly with the sec air bleeds. I found them to be 0.039" on 6000 series carbs & reduced to 0.029" on many later 9000 series carbs, which used smaller sec jets. At least one model TQ here used a 098 sec jet & a 101 pri jet! Yes hard to believe!

It is not just fuel jet size then that affects mixture....& how the carb performs. The sec nozzle bars on TQs have holes drilled in them, different sizes, numbers & different spacing depending on the engine they fit. This alone could affect performance. Sec t/blade opening, air valve fully open position, air valve dashpot model etc will all have an affect on how the carb performs.