1. Registration trouble? Please use the "Contact Us" link at the bottom right corner of the page and your issue will be resolved.
    Dismiss Notice

Holley 390

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

  1. May 30, 2020
    colojeepguy

    colojeepguy Colorado Springs

    At the foot of...
    Joined:
    Apr 4, 2010
    Messages:
    7,179
    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. May 30, 2020
    jpflat2a

    jpflat2a what's that noise?

    Hermosa, SD
    Joined:
    Jul 30, 2003
    Messages:
    8,524
    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. May 30, 2020
    colojeepguy

    colojeepguy Colorado Springs

    At the foot of...
    Joined:
    Apr 4, 2010
    Messages:
    7,179
    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. May 30, 2020
    jpflat2a

    jpflat2a what's that noise?

    Hermosa, SD
    Joined:
    Jul 30, 2003
    Messages:
    8,524
    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. Jun 2, 2020
    Warloch

    Warloch Did you say Flattie??? Staff Member

    Falcon, CO
    Joined:
    Mar 4, 2003
    Messages:
    5,470
    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
New Posts