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Thinking about ditching the quadrajet.

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by BillyBob, May 29, 2001.

  1. BillyBob

    BillyBob 1/2 ton status

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    Since I really won't be needing my quadrajet on my 84, and I wanna get a nicer intake anyway, what kind of combo should I use? I was thinking about an edelbrock performer carb/ intake or something. I wanna get some more low end power, and a smaller CFM carb.

    <A target="_blank" HREF=http://billybob.coloradok5.com>http://billybob.coloradok5.com</A>
     
  2. Grim-Reaper

    Grim-Reaper 3/4 ton status Author

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    Re: Thinking that would be a mistake!

    Quad is by far one of the best on and off-road carbs ever built (as long as you don't have one of the electric mix control units). One of the things that makes a quad so good is even though it may be rated 795cfm it only will flow what the engine needs. That is the purpose of the doors on the top of the secondairies. So don't let it's peak flow rating confuse you. If your truck can only handle 500cfm that carb will only flow 500cfm.
    Holly's are just plain junk and with the quad having smaller primaires your actully going to get better economy from the quad. You floor it you will get all the juice you need.
    Now your asking for 2 different things that go against each other. You want a lower cfm for economy but you want low end power. See the conflict here? The Quad is going to be about the best but your still can't eat the cake here. There has got to be some give. You can loosen up the doors on the secondaires to get them to open a bit quicker and you can put some bigger jets in and get more low end but you can't have high economy with lots of grunt.
    You may also be blaming the carb for weak off the line power when the problem is not the carb it's the gearing. No matter what carb you put on it is not going to fix or cover up a gearing problem. Big motor or fix the gearing is all you can do.
    Fixing the gears would be the best. still retain the economy, might even improve because the engine will not have to work as hard but get you off the line quicker. My bet is your running a tall tire and 3.08 or a 3.42 gear. Your probably also running a 305.



    Diging it in the dirt with my K5's
    Grim-Reaper
    <A target="_blank" HREF=http://grimsk5s.coloradok5.com/>http://grimsk5s.coloradok5.com/</A>
     
  3. BillyBob

    BillyBob 1/2 ton status

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    Re: Thinking that would be a mistake!

    I'm only going to be running 31s and I don't know the gearing of the rear diff. The engine is a GM crate 350. I dunno any specs, nor have I really gotten the chance to take it out on the road yet, since I just got it back together about a week ago. I got headers on the exaust, but the rest of the exaust isn't hooked up. Made for some nice attention when I had to get it on a trailer yesterday to bring it to a shop [​IMG]. Anyway, My friend said I should probably go with a smaller carb and he says the quadrajet is junk. I highly disagree, and would trust it better than any other carb out there for off-roading. But this truck is going to be a street truck for the most part, with very little offroading. So, I thought maybe it would be a good idea to go with a carb around 650 CFM. But, if you say to keep the Q-jet, I will. But what is a good manifold to compliment it? looking for idle- 5,500 RPM power. I was thinking edelbrock or weiand (sp), but I dunno what bolts to a Q-jet.

    <A target="_blank" HREF=http://billybob.coloradok5.com>http://billybob.coloradok5.com</A>
     
  4. wayne

    wayne 3/4 ton status

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    Keep the Quad and bolt it to a Edelbrock Performer intake.

    <A target="_blank" HREF=http://jamonline.homestead.com/fromthegroundupK54x4/89Jimmy.html>http://jamonline.homestead.com/fromthegroundupK54x4/89Jimmy.html</A>
    <font color=blue>Happy Trails<font color=blue>
    <font color=blue>Wayne<font color=blue>
     
  5. xnoahx

    xnoahx 1/2 ton status

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    Your best bet is too kepp the quadrajet, bolt up and edelbrock performer intake, you can ususally find those for less that retail on ebay and they polish up real nice with a wire wheel. Also, you can send out the carb to be rebuilt to stock specs or to better than stock specs. by jet performance products for about $200. Thats about the price of a new edelbrock carb. I already have the manafold, now I'm saving up for the jet rebuild.
     
  6. Zepplin

    Zepplin 1/2 ton status

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    Keep the quad. A friend had a Holley carb in his Heep and a slight incline would bog down the carb. Edelbrocks suck in my opinion too. Just my 2 cents.

    74 Blazer
    Zepplin
    See my site at: <A target="_blank" HREF=http://www.jeremyb.coloradok5.com>http://www.jeremyb.coloradok5.com</A>
     
  7. Pugsley

    Pugsley 1/2 ton status

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    Keep the Quadrajet, bolt up a Performer intake, and plumb a new fuel line from the pump to the carb (3/8" braided is best), and all will be well.

    I'm not creative enough to comeup with a new signature [​IMG]
     
  8. ChevyCaGal

    ChevyCaGal 3/4 ton status

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    I'm with Grim (how could I not be? [​IMG])....but really keep the q-jet. Also check out the gearing. I was blaming problems on my carb but what it came down too was the fact I have 3.08 gearing. I'm heavy with my foot when it comes to off the line. They are awful! But consider that and changing them because that'd help....

    "Suck Fumes Ford Boy"
    "I love my country, I fear my government"
    <A target="_blank" HREF=http://www.chevycagal.homestead.com/steph.html>http://www.chevycagal.homestead.com/steph.html</A>
     
  9. BadDog

    BadDog SOL Staff Member Super Moderator Author

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    Another vote for the Quad. There is only one carb I would run, PERIOD. That is the Q-Jet. If you don't want to keep an older worn (perhaps temperamental) Q-Jet, get a new one from Edel. That is THE best carb I have ever run bar none and I’ve run many different carbs.

    Bad Dog

    85 K30 CUCV, 350 TBI, TH400, NP205, D60/C14, 4.56 Locked
    Soon: 4" lift, 40" tires, massive cutting, shorter wb and rear overhang.
     
  10. ScoobyDann

    ScoobyDann 1/2 ton status

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    I had a Holley 650, let me tell you it was badass on the street, but thats where the badass ends. Off road, any little incline and it crapped out. got an adapter and swapped in the good ol' quad. I'll never look back. oh yea, I have the holley street dominator intake. Good for low end.

    <A target="_blank" HREF=http://jimjim.coloradok5.com>http://jimjim.coloradok5.com</A>
     
  11. K5RON

    K5RON 1/2 ton status

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    IMHO, the only way to improve on the Quad is to swap it out for fuel injection!

    Ron
     
  12. thatK30guy

    thatK30guy 1 ton status Premium Member

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    Yep, another vote for the Q-jet!!! [​IMG]

    My 454 had a worn out Q-jet once. So I simply bought a brand new Edelbrock Q-jet part no. 1904 and bolted it on the Performer intake that was already on it. That combo runs EXCELLENT!!! I have experienced Holleys on a different truck I had and will never use them again!!! [​IMG] THEY SUCK!!

    When In Doubt, Whip It Out!
     
  13. 1bad82k5

    1bad82k5 1/2 ton status

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    I used to get rid of my q-jets because i could never keep them tuned, but i now believe they are the best carb around. I have had 4 edelbrock performer carbs in the past year and three of them were bad from the factory. Normally I really like edelbrock stuff, but the poor castings kept the idle-air screws from doing anything. Stay with the q-jet(cheap fuel injection)
    eric

    Hell, it don't really matter....it's just for my race car.
     
  14. nd_4_mud

    nd_4_mud Registered Member

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    I love my q-jet. I had it rebuilt from this guy who does nothing but carbs and he specailly loved to rebuild q-jets. Ever since then i have had zero problems with it. That was 2 years ago. It has never bogged done on inclines. And i have almost flipped the truck. I bet it would run upside down. HeHe. Stay with the Q its your best option..
     

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