General Category > Quadrajet Carb Talk and Tips

primary rod suffix confusion

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Cliff Ruggles:
There are many carburetors starting with 1705 or 1708 that still use the longer primary metering rods, such as all of the Marine units, and 1975 to 1978 Chevy truck carburetors (no CA emissions)......Cliff

unruhjonny:
/\ now that, I had no idea...

I had understood that the 70 vs 170 numbering system was to denote a raised bottom of the fuel bowl - which necessitated a shorter needle.

Huh.

Thanks for sharing some more of your knowledge Cliff!

Cliff Ruggles:
As far as what you are most likely to find, "B" series were used in a lot of early units and many of those carburetors will have the early APT system in the baseplate between the mixture screws.

"K" rods are quite common from 1975 to 1980 or so and used in the later style APT units. 

"M" series rods were used in the 1979 and later APT Q-jets with the single main airbleed design.

Of course there are a few exception here and there, most will be Holden, Canadian, Motorhome and Marine applications......Cliff

unruhjonny:
Thanks Cliff!

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