Dual quads versus big hammer!!!...

PRH said
Two carbs don’t flow twice as much into the motor...... they just flow 1/2 as much through each carb than if there were only one carb.

This style of carb is dependant on air flow for proper secondary operation, so cutting the air flow in 1/2, creates a problem/challenge.
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BINGO! Not saying they can't work, but it's why its being a pain to tune. Carbs pull nothing into a motor, the motor pulls through the carbs. Precisely why I suggested what I did in post 132