General Category > Quadrajet Carb Talk and Tips

A/T and M/T carbs

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Erick:
Hi,
What is the difference between an A/T and M/T carb ?

Kenth:
Several, like available vacuum ports, calibration and throttle lever. Any certain year in mind?

Erick:
No, no particular year in mind. After my troubles with the remanufactured carburetor I am still looking for another carburetor, but it is not easy to find here in France espacially M/T carb. And before making another mistake I wanted to know the difference between A/T and M/T carbs. My car has M/T. I've seen on Lars's papers that calibration seems to be the same for Vette A/T or M/T small blocks.

Kenth:
CSB M/T and A/T may very well have the same main jets, primary rods and secondary rods.
But, generally the idle/low speed calibration is richer in the M/T carbs.

What would be the number on Q-jet needed?

quadrajam:
Dont bother with a M/T carb. Not neccessary and usualy have a lot more wear to the moving
parts. Properly built with Cliffs parts and recipe a Q-jet will be fine on a A/T, M/T CVT, Jet drive,
Reeves drive or whatever.

QJ

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