OK, but a TQ has that adjustable flapper, and "just sayin" you might have found that even though it seemed great with a 750, it might have run better with a 700 or even 650.
Isn't a 670 a vacuum secondary? They are much more forgiving than a DP
yes, 670 is VS. Yes, the TQ has the adjustable back flap. Last, they may have ran "as well" with a smaller carb, I doubt better.
Carbs don't "push" air and gas into engines. The engine "pulls" what it needs.
