General Category > Quadrajet Carb Talk and Tips

B stamped primary rods

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mcx:
 Hello Cliff....can the later  quadrajets (1705/1708) that have the air lid  converted to a adjustable APT modified , use the B series primary rods to compensate for their longer length? or do those B series need to be trimmed down to proper length no matter what? Thanks, Mike

Cliff Ruggles:
I don't exactly understand the question, but "B" Series primary rods are used in the earlier carburetors with the APT system in the baseplate.

We make and sell the shorter rods for the later APT units with both .026" and .036" tips so no need to modify anything to try to use the incorrect longer rods in them......Cliff

mcx:
Sorry for my wording,     Is it possible to just trim the extra length off a "B" series rod to make it work in a "M"series application?

Cliff Ruggles:
No, the overall length isn't the issue, it's the distance to the tapered section of the rod that would sit in the jets when the power piston was in the down position.

Use the correct parts here, early carbs get the longer rods, later carbs get the shorter ones.  Most SMAB use "M" series and the others use J, K, L, and P for the most part.  There were a few early units that got "M" series rods in them, late 70's CA emissions Olds units come to mind here.......Cliff

mcx:
Cliff, Thanks for taking the time to reply...i thought by making the airhorn APT adjustable (1705/1708) you might be  able to precision place the B series rod  taper in the jet?  I'm starting to like the later versions now as that piston tower has a lot more adjustment and precision than the base plate APT style.

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