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carburetor cfm question

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by possum, Mar 17, 2002.

  1. possum

    possum Registered Member

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    Location:
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    I'm replacing my carburetor. All the remanufactured ones have been junk. At Summit Racing.com they have one that says " Chevrolet/GMC: 1974-78 350-454
    trucks and cars with a divorced style
    choke, 750 cfm Performer Q-jet
    carb

    This brand new carb is 50 state legal
    for 1974-78 350-454 Chevy/GMC
    trucks and cars originally equipped
    with Quadrajet carburetors. It's
    engineered and calibrated to stock
    specs and has all required vacuum
    ports. The triple booster primary
    venturii design makes for great
    drivability and optimum fuel
    economy."
    Is that the factory or original amount of cfms for my truck? My engine is stock and I don't know how many cfms I'm supposed to be running without flooding out my engine. It's just a regular 350. The picture they had looks exactly like the one I just took off(minus the edelbrock name). If it isn't the right one can someone give me the part number or the type that should go on my truck?
     
  2. Thunder

    Thunder 3/4 ton status

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    Location:
    Northeast Nevada
    There were 2 types of Q- jets they used back in the 70s
    One was the 750 cfm with the divorced choke that you described above.(Edelbrock#1901)
    The other was a 795 cfm with a hot air choke(.Edelbeock#1902)
    Either one will work fine on your truck.
    IWhich one you need depends on what kind of choke you have.
     
  3. zakk

    zakk 1/2 ton status

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    very true. Also remember that if you decide to go to a traditional carb, don't get a 750 or 800 cfm "cuz it matches the q-jet cfm"

    Q-Jets are a "variable" cfm type unit. So if you decide to go to a carb, a 650 would be plenty for down low torque.
     
  4. m j

    m j 1/2 ton status

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    what troubles have you had with remans?
    I dont think there is a difference in performance between a reman or that new one
     
  5. CaptCrunch

    CaptCrunch 1/2 ton status

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    I personally wouldn't shell out that much for a quad. Find a good rebuilder that offers a good warranty locally. Otherwise just do it yourself... it isn't super tough and even if the problems occur again down the road at least it was cheap. Those Edelbrocks IMO are a rip off
     
  6. reddog64

    reddog64 1/2 ton status

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    Location:
    Federal Way, Washington
    There's a newholly out that's for offroad use... can do a 45 degree climb and a 30 degree roll w/o stalling... it's not expensivea t all...

    check itout...
     
  7. NoSmog73

    NoSmog73 1/2 ton status

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    I just bought the jet stage 2 Q-jet from summit and I really like it it was easy to install (duh) I have noticed a good powerband to and really good take off and when you step on it to pass someone else it kicks A## just my 2 cents..mike
    If you want the info on it pm me
     
  8. NoSmog73

    NoSmog73 1/2 ton status

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    Here is the part# JET-35002 you can see it at summit 359$$
     
  9. foolinjected

    foolinjected Newbie

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    I am on my 3d Edelbrock Q-jet in 1 year! This one is not good,but at least it runs. I would try the new Holley.
     

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