Quadrajet Problem Solving > Quadrajet Parts and Numbers

More on Basic Part - casting - Numbers

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makomark:
Thanks for the responses.

I have a few service manuals and TSB-equivalents and will see what I can find. I concur with your timeframe and the transitional products. I do know they used a small, 2-bbl, MerCarb (that I was told was a rochester 2G knockoff) thru 1998 model year.

The V-8 service books split at 88-89 and 92-93. My guess is no more Q-Jets after 1992. that would infer no more production after 1991 (late 1990 on the early end,  early 1992, at the latest).

If more cast numbers show in the service pubs, I'll add them if there's any interest

makomark:
Did some more checking in the service manuals.

found there were two small block versions that were made 1993 thru 1995 w/ a Qjet. one used a 17080565 casting and one used a 17085013 casting. In 1996, all production deliveries with Qjets had ceased.

Cliff Ruggles:
Good information.  It appears that they used some Webber AFB clones when the Q-jets were first phased out, as we've encounted a couple of them.  Not sure how they worked out, as those carbs are the WORST carburetors I've ever worked on.  The accellerator pump is always defective, and they have no adjustment for the opening rate of the secondary airflap.  The owners of every one we've worked on complained of stumble/hesitation/bog when going quickly to full throttle.  Imagine trying the yank a couple of skiers out of the water and have the engine stumble!......Cliff

makomark:
Sorry for being a bit slow on this but i think I've got the light bulb glowing now....

Marine Q-Jets, even the 170 series, are early (702 type) casting designs. This means they not only use the 'older' style floats but also the longer 703-style primary rods. So the mantra "don't use 70 series primary rods in a 170 series casting" doesn't apply to the 170 series marine Q-Jets?

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