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4M-Style SMB Truck Carb. Primary Rods...

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Ethan1:

--- Quote from: Cliff Ruggles on August 08, 2014, 04:41:16 AM ---I would also mention that the factory calibrations on that particular carburetor varied some, and will NOT be what is found in the "book" if you look them up.

Most had either 63 or 64 main jets, and metering rods ranging from .036" to .040".  They were fine tuned by the factory using the APT system in the baseplate.

Those are excellent carburetors, using the later SMAB set up bit early castings and still divorced choke.....Cliff

--- End quote ---

 Good point, Cliff. Some carburetors were calibrated differently, than what the book states. Agreed 100%. :D

Cliff Ruggles:
Yes, I find LOTS of deviations in the jets/metering rods used, especially on the later production units.  The book should be used for "reference" only, at least when it comes to basic tuning/parts selection......Cliff

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