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Quick fuel lean top end

Discussion in 'Carburetor + Boost Tech Questions' started by 38Pontiac, Apr 9, 2019.

  1. 38Pontiac

    Joined:
    Aug 13, 2015
    750, 850 bottom. Made blow through. Was fine till i built up the motor. Heads intake cam, way bigger. Now my afrs start 11 and creep to 13 by 4000 rpm. Motor can run to 7k
    Running 2 fuel pumps 600ghph 1/2 line, 1:1 regulator.fuel pressure volume fine.
    Drilled up jets. It helped but also richened cruse way high. Put a .015 wire in high speed bleeds...also helped but really need this correct. No jets in power valve
     
    38Pontiac, Apr 9, 2019
    #1

  2. turboisuzu

    Joined:
    Oct 29, 2018
    that’s disappointing. my first shop tried hunting down my tuning issues for a month before giving up. my second shop tunned her in an afternoon. best of luck
     
    turboisuzu, Apr 9, 2019
    #2

  3. tbird

    Joined:
    Sep 1, 2004
    What fuel pumps and regulator?
    How much power to you guestimate?
    What have you drilled the jets to.
    Do you have vent tube extensions?
    What hat is on the carb?
     
    tbird, Apr 10, 2019
    #3

  4. Monzsta

    Joined:
    Dec 12, 2010
    Is the fuel tank vented properly? A lot of times if the tank can't vent you'll get a decreasing supply from even the best pump.
     
    Monzsta, Apr 11, 2019
    #4
    MR.GSL and tbird like this.
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