Quadrajet Problem Solving > Diagnose a Quadrajet carburetor problem

Where to start?

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JimC:
I am intrigued with the idea of Q-jets working like FI.  I have 3 Q-jets, I am wondering which would be the best platform to start with?

     17081226
     17082226
     Edlebrock 1904

I have Cliff's book and 3 other Q-jet books.  Right now, I have a Holley on my truck, but I believe I can do better.  My vehicle is an 81 Jimmy.  I have a new 249hp 350 crate motor with an EPS intake and a 570 Street Avenger. (I have 2 more Holleys).  I still use the cast iron exhaust manifolds, but have gone to 2" dual exhaust.  Since the warranty is still good on my engine, I have not made any real changes to it.  I have, however, changed the drive train.  It came stock with 2.54 rearend.  Shocked(GAG) Now I have 3.73 front and rear with LSD's.  I am only interested in fuel economy and torque.   

So where from here?

Jim

comp:
i'd do headers and 2 1/4 or 2 1/2" pipes with a H or X , before diving into this ,,,but thats me  ;D

JimC:
Thanks for the come back.  Headers are in the future, but also, I want to start from the top down.  Carb and intake, then I have to change the radiator and waterpump.  Finally a 700r4 tranny.  I have a th-350 now and I would like OD.  The headers are next.  Most of the parts I have all ready.  I am hoping to figure out which carb should be my base to start.

Thanks again,

Jim

jamesF:
Jim-
I think in the book, Cliffs states that he likes the later Carbs (76-79) For their flexibility.

Based on the Numbers Article on Cliffs site here:

http://www.cliffshighperformance.dreamhosters.com/tech_carb_ID_2.html

From what I can discern your Q-jet carbs both appear to be Chevy Carbs. One is an 81 one is an 82.
Probobly identical except the year.
Based on http://www.cliffshighperformance.dreamhosters.com/tech_qjet_history_5.html
It sounds like you can make good use of those carbs once you remove the EEC "stuff"

I cant speak to the merits of the Edelbrock. Im sure Cliff will respond.

makomark:
Jim:

If memory serves me right, 81 was the year of the electronically controlled solenoids and reinforces JamesF's "EEC stuff" observation. Based on your choices, assuming you don't have an ECU with your crate motor, go with the edelbrock - those electronic controlled beasts aren't worth modifying to a pre-1981 state.

I'd do the transmission first as the OD will help with the economy. You also won't have to remove those "recently installed" headers, with their rusty bolts, if you adjust your plan - just a thought.

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