General Category > Quadrajet Carb Talk and Tips

Idle Fuel

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Cliff Ruggles:
They used idle bypass air on all the big block Chevy carbs I've seen in 1970, and later units. 

Idle tube size was determined by engine requirements, along with the size of the idle airbleeds.  Tyically they used larger idle airbleeds on those carbs, so they had large idle tubes in them from the factory....Cliff

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