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Holley 390

Discussion in 'Early CJ5 and CJ6 Tech' started by colojeepguy, May 30, 2020.

  1. colojeepguy

    colojeepguy Colorado Springs

    Holley 8007 on a Dauntless, whats everyone running for primary jets? I know I'll have to reduce them due to my elevation, but I'm just looking for a baseline.
     
    colojeepguy, May 30, 2020
    #1
  2. jpflat2a

    jpflat2a what's that noise?

    No experience with Holley.
    Aren't jets sizes the same though ?
    .051 factory
    .049 over 5,000 ft
    .047 over 10,000 ft.
     
    jpflat2a, May 30, 2020
    #2
  3. colojeepguy

    colojeepguy Colorado Springs

    Jet numbers don't necessarily correspond to numeric size, and different carbs take different calibrations.
    Oh, and I live at 6500 ft and most of my off roading is 9000-12000 ft :D
     
    colojeepguy, May 30, 2020
    #3
  4. jpflat2a

    jpflat2a what's that noise?

    So a Holley 51 flows different than a Rochester 51 ?
    Why have numbers then ?
    No, I'm not a jet scientist.:D
     
    jpflat2a, May 30, 2020
    #4
  5. Warloch

    Warloch Did you say Flattie??? Staff Member

    Doug - my notes say I was using 46 to 48 jets on the 390 the last time I ran it - black secondary spring, but can't find the PV I was using on it.
     
    Warloch, Jun 2, 2020
    #5