Will an 800 cfm qjet be enough for my combo

Discussion in 'The Venerable Q-Jet' started by bostongsx, Sep 19, 2008.

  1. bostongsx

    bostongsx Platinum Level Contributor

    I have a built 455 with trw forged pistons that have been fly cut, a cam with about 540 lift, ta shorty headers, and a b4b. Can an 800cfm carb handle this?
    Thanks
    Herb
     
  2. 70 gsconvt

    70 gsconvt Silver Level contributor

    As long as you don't rev it past 5500 rpm's, I'd think it would be OK.
     
  3. carmantx

    carmantx Never Surrender

    Herb, sounds a lot like my 464.

    Are you talking about an 800 CFM QJet? If so, it will need a few modifications, but that is what we are running on ours. On the dyno, it only picked up about 7 horsepower when they put on a 950 holley.

    If you are thinking 800 cfm QJet, I'll let you know what I did to ours to make it work. I love Qjets.

    And Phillip is right, my son shifts at 5200 and rev limiter is set at 6000 on our car. HP and Torque quit at about 6000. When we change converters, we will go with an SPX intake and proform 950 and go up to around 6000 to shift.
     
  4. pro tour gsx

    pro tour gsx pro tour gsx

    I have a 800 qjet on a 462 stage two engine and it works great smaller cam then yours and shorty headers , the car has run 11.3 @121 and will go faster with this carb. I had it rebuilt by john osborne.
     
  5. bostongsx

    bostongsx Platinum Level Contributor

    What are the specs on your carbs guys? Jets/Rods?
    Thanks
    Herb
     
  6. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD" Staff Member

    John Osborne prepped 1972 800 CFM, 7042240, 76 jets, 46B primary rods, BG secondary rods.
     
  7. bostongsx

    bostongsx Platinum Level Contributor

    Thanks Larry what hanger are you using?
     
  8. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD" Staff Member


    I forget, I'll have to look.
     
  9. copperheadgs1

    copperheadgs1 copperheadgs1

    Herb, I bet any hangar between E-J is fine.
     
  10. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD" Staff Member

    I looked:laugh: I have a "K" hanger
     

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