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post #1 of (permalink) Old 03-13-2001, 06:18 PM Thread Starter
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Quadrajet Question??? CFM??

Well i got my quadrajet rebuilt. It is for my 4.1L buick V6. I found out was originally grom a cadillac el dorado. Does anyone know what CFM it is, or is there a spot on the carb that indicates this? Also my frind who rebuilt it took it to the carb specialist at his work and the guys said it was missing some internal items that aren't in the rebuild kit. So if this carb doesnt work when i install it tomorrow, then i am going to an edelbrock carb. What size edelbrock would be good for this V6? I am not looking for total performance, but good mileage. I only have a 9 gallon tank in my jeep and i would like to not have to constantly feed it petrol.
Thanks for the help

Dan Stewart 1963 CJ5 "Caloosa Jeepers" member

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post #2 of (permalink) Old 03-13-2001, 07:29 PM
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Re: Quadrajet Question??? CFM??

Most q-jets were 600's and 650's. They make 800's for the big blocks, and I won't write this in stone but was told before that the 4.1 carbs were 500 cfm's. No fact here , just here-say.


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post #3 of (permalink) Old 03-13-2001, 08:10 PM
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Re: Quadrajet Question??? CFM??

If you want to do serious wheeling, stick with a Q-Jet. Only thing better is fuel injection. I'm running the Edelbrock Q-Jet model #1904 on both my Jeeps with great results. They are rated at 795 cfm, but will never will use their full potential due to engine sizes. The 1904 uses electric choke. The other Edelbrock Q-Jets use remote or hot air chokes. Possibly an '80-'89 GM truck would have a Rochester Q-Jet w/elec. choke for a less expensive alternative, either wrecking yard or rebuilt replacement.

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'70 Wagoneer w/Buick 350 V-8
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post #4 of (permalink) Old 03-13-2001, 09:52 PM Thread Starter
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Re: Quadrajet Question??? CFM??

I really want to keep the quadrajet, but if it doesn't work this time around then i have to get a reman one or an edelbrock replacement. I have had alot of down time with my jeep and i really cant wait to find a junkyard one, rebuild it and then hope it will work. How much did your edelbrock run Tim?? I saw the edelbrocks on Jegs for about $199, 189 for a reman unit and that is for 500 cfm. I don't run that much on rocks or hills, pretty flat in florida, but my main concern for a carb is the fuel getting shaken up and stalling out, we run alot of washboard roads. I do have the edelbrock performer intake for the 4.1L engine, so i don't know if it is matched to a certain edelbrock carb.
thanks
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post #5 of (permalink) Old 03-13-2001, 10:28 PM
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Re: Quadrajet Question??? CFM??

GM produced many versions of the Q-J however only two different bores sizes were used resulting in a 750 and 800 CFM, BUT CFM ratings could be less depending on how much the air door was allowed to open, that’s why you may see Q-Jets rated at smaller flow rates for smaller V-8s and 6's
depending on what parts you need I might have it.
What do you need?
I will need the model # found on the driver side, secondary bore of the main body.
If you are able to take a photo looking down into the primary bores with the throttle plates and choke open I might be able to give you an idea what you have.
e-mail me @ [email protected]


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post #6 of (permalink) Old 03-14-2001, 07:59 AM
 
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Re: Quadrajet Question??? CFM??

Hey Dan,
I saw those in the jegs catalog too, but they are the regular square bore models the "Performers". You want the quadrajet ones which are more like $300.
Some guys on the BBS got pretty good deals on rebuilt units from Parts America or Advanced Auto....can't remember which but they were in the $130 range.

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post #7 of (permalink) Old 03-14-2001, 11:07 AM
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Re: Quadrajet Question??? CFM??

Edelbrock calls their Q-Jet the "Performer Q-Jet", not to be confused with the Edelbrock "Performer", which is a clone of the Carter "AFB". The Edelbrock Performer Q-Jet #1904 runs $435-$450 at Jegs and Summit. This is what I'm running on top of the Edelbrock Performer intake manifold for my 252/4.1L in my Jeepster. The Edelbrock "Performer" and Carter "AFB" run $225 or so. If you want a new carb and won't save up for a Q-Jet, then you might be okay with the Carter # 9504, (elec choke), 9502, (manual choke) or Edelbrock 1404, (manual choke), with or without electric choke kit #1478 along with spring-loaded needle and seats. These carbs are rated for 500 cfm. My tune-up Guru says the Carter AFB's have better quality control over the Edelbrock Performer's. But the Q-Jet will run at nearly any angle. If you go with a Q-Jet on the Performer intake, you'll need a spread-bore to square-bore adapter which runs about $20.

Tim
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'70 Wagoneer w/Buick 350 V-8
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post #8 of (permalink) Old 03-14-2001, 02:13 PM
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Re: Quadrajet Question??? CFM??

Try Advanceautoparts.com - about $130.00 is what members of this board have told me. Good Luck

post #9 of (permalink) Old 03-14-2001, 02:36 PM
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Re: Quadrajet Question??? CFM??

Right on, the commonly available Q-Jets all have the 750 or 800 cfm bore size. Some of the late '60s GM V8 cars used a restrictor that would set how far the secondary throttle plate would open to limit the horsepower, since the same engine block was used in a higher horsepower model. I just picked up a Qjet off ebay from a '68 454 Buick for $50, in working condition, which I am going to rebuild and use on my Jeep. There is really no need to buy a new one if you have the skill to rebuild, which really only requires patience and the ability to follow directions. Get a book. The nice thing about Q-jets is they are really well designed and rely on measuring engine vacuum for metering fuel. This means that they don't care what the displacement of the engine is, as long as it isn't too big for the cfm rating of the carb. The only re-jetting you should have to do is for altitude. You can also adjust things like partial- throttle enrichment, but you shouldn't have to.

This is differant than the holley design, which has to be closely matched to the engine size.


The best thing I can recommend is to get a book for your carb, it will save you lots of hassle and teach you a lot. All that for less than $20 is a bargain.
Regards,
Josiah

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5.38:1 gears, 11" brakes, Bestop Supertop, Hurculiner
post #10 of (permalink) Old 03-14-2001, 11:52 PM Thread Starter
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Re: Quadrajet Question??? CFM??

Thanks for the advice guys. I i ever get my intake in then i can test the carb and plan my next course of action.

Dan Stewart 1963 CJ5 "Caloosa Jeepers" member

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