General Category > Quadrajet Carb Talk and Tips

Q-jet with 3 mixture screws? 17085213

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Glutenfreecarbs:
I've put my 17085213 back on the shelf for now; I was never able to cure the nasty lean spot when quickly going to WOT, even with my stash of old OEM choke pulloffs. Also had a pretty decent lean backfire while trying to impress Mrs. Gluten on a date night...

I still want to try removing those little partitions in the secondary accelerator wells to get more "squirt" as the air valve is opening, but I haven't thought of a civilized way to do this. This unit has worked great for me otherwise; I ran it most of last summer...with 38J rods and .070 jets because Reasons.

Kenth:
I have built several of this model and always removed the extra wall in the secondary initial POE well. I have also plugged the holes for the adjustable extra air channels with set screws (were the toothpicks sits in your picture) in the secondary circuit as they were never used for high performance use.
Also, since the carburetor has APT, I have not found any reason to change the main jetting.

Cliff Ruggles:
Considering they are somewhat rare and application specific I save them for big block Chevy truck and heavy duty applications.  That is where they were designed to be used at and fair best in that scenario. 

Just like Rochester Marine Quadrajets they work best where they were designed to be used.  Since there were literally tens of thousands of 1979-up SMAB carbs produced that don't have that specific secondary bleed system and no goofy APT limiter, etc, it's just best to source out one of those instead if you are looking for the latest design as a starting point for your application.

I'd also mention here that the 17080212/213 carburetors are excellent units but don't use that system, if one is looking for a really nice starting point for a big block Chevy, heavy duty, or truck/motorhome or other towing application.....etc......

73ss:
The DCR's look huge, Did you measure them?

Cliff Ruggles:
They are huge, over .060" nearly as I can remember.

Those carburetors are NOT lacking for idle fuel and work reasonably well on big block engines even with slightly larger than stock cams in them.

They have other features that make them less than desirable for some milder applications and why I don't recommend using them much beyond what the factory designed them for.......

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