[Gaz64]

And most of the time, a throttle shaft gets twisted from the throttle lever retaining nuts being tightened without any thought as to where the torque load is going.

I'll reread this thread after I add this.

I'll have a guess and say that the rear barrel flows more than the front (LH bank; and the opposite for the RH bank) and I'd bet in most instances, this is the case when there is different flow within the same carb.