General Category > Quadrajet Carb Talk and Tips

Cadillac carb on stock 305

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davel:
Right here. 53M

Kenth:
Idle/low speed fuel is pushed thru the main jets to the idle tubes lower restriction up to a crossover were fuel is mixed with air from the upper idle air bleeds and then thru the idle down channel restriction to the off-idle slot and further down to the idle screw hole for fine tuning of the amounts of the pre-blended idle mixture.
Increasing the down channel restrictions and the idle mixture outlet holes on these emission oriented units will give a larger amount of idle mixture like the earlier non-EGR/catalyst carbs to have better control of the idle adjustment.

Drill as straight as possible and you

Cliff Ruggles:
The "M" series rods are incorrect for that carb number.  I suppose they could be made to work OK with huge jets in it.

I'm not surprised to see them in a remanufactured carb however.  I typically avoid those carbs here as they make other mods to them that most folks don't notice, like opening up idle bleeds to HUGE dimensions, they huge idle tubes to compensate.  Most have lead plugs driven into the bypass air holes in the main casting, and many will have miss-matched parts.

The acid bath and "tumbling" the parts get often leave them beat up some and softens the material.

I cringe when one shows up here and I tell customers that we do NOT want any sent here for any reason, too labor intensive.......Cliff

davel:

--- Quote from: Cliff Ruggles on November 27, 2019, 03:18:22 AM ---The "M" series rods are incorrect for that carb number.
--- End quote ---

Just to clear, the M rods in the image I posted are in my carburetor not the OP's carburetor.  I attached that image to illustrate how to find the part number on the primary rods.

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