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Old 09-01-2008, 01:13 PM
Rob Keller's Avatar
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QUADRAJET's The search for Knowledge

Howdy Ho HOTRODDERS!

I am looking for knowledge about the all mighty Quadrajet.

25+ years of use from cars to trucks some have electric stuff on them & some don't.

Some have lots of vacuum ports & some minimal.

Seems that I took to long to put the motor in my truck & I am pretty sure I left it sit on the bench too long.

I am also looking for a step by step guide on how to rebuild them .
I got 3 now that need fixing & just can't be bothered on waiting for someone else to rebuild them, nor the cash it takes.

So Please any & all information is greatly appreciated.

The Quest for Knowledge never ends



Thanks
Rob

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Old 09-01-2008, 01:30 PM
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You need to snag this quick!!! Cliicky here quick!!!

Covers just about everything Qjet! Got one myself, very good book!

Mark
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Old 09-01-2008, 02:39 PM
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How is Amazon .com?

Good ?Bad? Ugly?




R
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Old 09-01-2008, 02:41 PM
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Originally Posted by Rob Keller
How is Amazon .com?

Good ?Bad? Ugly?




R
Bought a few things there with no problems. 20 bucks and free shipping is a good deal.
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Old 09-01-2008, 03:47 PM
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You can also go to www.cliffshighperformance.com....Cliff Ruggles, great web site and a whole chapter on how to modify a Q-Jet.
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Old 09-01-2008, 06:00 PM
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That looks like a good book also.

I believe I contacted & spoke with Cliff from PY Years forum.

I am sure I will never build them as good as him but another reason for me to learn to do for myself
$$$$$$$.

I might get both.

Any Special tools Y'all suggest?



R
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Old 09-01-2008, 08:08 PM
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I'll give you my quick primer just to get you started. Its not a lot but its some basic info that I have learned during my recent passion with the world's greatest carburetor You may already know this so skip it if you don't want to read

All Qjets are either 750 or 800 cfm. The 750 was used on anything from V6s up to small blocks and some big blocks. The 800 was used on many of the larger engines; 455s, caddy 500s, etc. Between 1976 and the electronic years, all trucks, vans, and HD vehicles got the 800 regardless of engine. When in doubt, a good eye down the bores can tell you right away.

You might hear about a rumored 850 cfm model used on stage 1 buick 455s and COPO 454 chevys, but its never been confirmed.

Decoding information comes from the stamping on the side of the bowl casting. It begins with either 70 or 170. Use it, but only as a guide. About one quarter of the Qjets I've decoded don't match up exactly to their application denoted by the stamping.
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Old 09-01-2008, 09:52 PM
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Quote:
Originally Posted by Rob Keller
How is Amazon .com?

Good ?Bad? Ugly?




R
I get stuff off Amazon every once in a while, never a problem.. even buy thru Amazon sellers w/o issues.
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Old 09-01-2008, 09:57 PM
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there was also a 500 CFM version used on turbocharged 231 Buicks, ported for use with a draw thru turbo ( boost refrenced ). they really are 750 CFM, but they were engineered down to 500 CFM, by the throttle blades.
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Old 09-02-2008, 07:49 AM
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Get the how to info in the Knowledge Base on this site,
http://www.hotrodders.com/kb/carburetor
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Old 09-02-2008, 03:38 PM
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Let me know if you find anything about gas dissapearing after sitting about 1-1/2 to 2 days


I was positive the welch plugs were leaking, but there were no stains there, plus I set the open carb with the base removed, on a bench for a hour with gas in it, and can't see any leaks at the plugs or elsewhere.

I am stumped. The carb will loose all the gas even if I only start & move the truck, then let it sit, so it is not heat-related.

New kit & float, too
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Old 09-02-2008, 04:18 PM
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Hey Y'all

Here is the working link for Cliff Ruggles

Not to get off the subject but I think I found one of these @ the 1in 6 Bone Yards I went by today .



Quote:
Cliffs High perf page.
Here's a great salvage-yard find, a 1971 Buick carburetor. These carburetors were the first large primary bore castings, often referred to as "800 cfm" carburetors. They are easily identified by the slashed front vent tube and long curved arm on the throttle linkage.
They want $75 for each core.

Is it really a score?
I am just asking to save it from the heap pile.
Maybe sell it to someone who needs it?
I need to check the #'s on the side

I have not read the links you all have posted yet, Thank you all so very much! I will be posting back to tell ya how I make out .



R
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Old 09-02-2008, 04:35 PM
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Quote:
Originally Posted by Rob Keller
Hey Y'all

Here is the working link for Cliff Ruggles

Not to get off the subject but I think I found one of these @ the 1in 6 Bone Yards I went by today .





They want $75 for each core.

Is it really a score?
I am just asking to save it from the heap pile.
Maybe sell it to someone who needs it?
I need to check the #'s on the side

I have not read the links you all have posted yet, Thank you all so very much! I will be posting back to tell ya how I make out .



R
I would NOT spend $75 for a "core" carb!!! Depending on the year, maybe 15, unless you can absolutely verify that the carb number is legit AND is worth the investment.

I also don't ever recall hearing about the slanted vent tube being the indicator of the 800cfm carb. But then again, there is a lot of contradictory info out there.

I would also look for a newer qjet that has the electric choke as they are much easier to setup for winter weather. My old heat riser qjet took a loooooong time to heat up and fully open the choke. Even the electric versions can be had cheap but almost all the qjets I've had needed to have the base reamed out and bushings installed for the primary throttle shaft. The get old and worn since the linkage AND the spring both pull in the same direction.

The newer electric ones will also have a fairly lean idle circuit so if you have a big cam, you will need to drill out the idle circuit restrictors (NOT an easy thing to do) OR get an older non-elect. choke version.

Last edited by Jmark; 09-02-2008 at 04:45 PM.
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Old 09-03-2008, 03:51 PM
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Here's some good stuff....


http://www.vettemod.com/forum/forumdisplay.php?f=47
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