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600 cfm on a V6?

Discussion in 'Early CJ5 and CJ6 Tech' started by SandhillMike, Aug 1, 2005.

  1. Aug 1, 2005
    SandhillMike

    SandhillMike Moderator

    Archer, Fla
    Joined:
    Oct 25, 2003
    Messages:
    246
    Still haven't found a decent, cheap 390, but I have 2 near new 600 cfm carbs, a Holley and an Edelbrock. Has anyone used that big a carb with the V6 or is it more than the motor can handle, I'm using an Offy manifold. This would be a tempory instalation untill I find a 390.
     
  2. Aug 1, 2005
    181jeep

    181jeep Banned

    central valley, ca
    Joined:
    Feb 3, 2004
    Messages:
    376
    toooooo big.
     
  3. Aug 1, 2005
    DanStew

    DanStew Incorrigible. Staff Member

    Lexington, South...
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    Sep 22, 2002
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    4,223
    you know i wonder if you can jet down th edelbrock to work. i have the 500 and it is great and i have the calibration kit. maybe shoot an email to edelbrock and see if it is possible to rejet and rod th ecarb to make it work, they should know. but i would recommend the edelbrock, it is simpler. get the of road spring kit for needles
     
  4. Aug 1, 2005
    Warloch

    Warloch Did you say Flattie??? Staff Member

    Falcon, CO
    Joined:
    Mar 4, 2003
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    4,521
    The 231 that originally came in the '51 had a Carter 600 (Edelbrock) that was so tough to run it was crazy. I put the 390 on and had no problem. I didn't have too much sucsess with the Edelbrock 500 on my setups... Prefer the Holley 390 right now.
     
  5. Aug 2, 2005
    67cj5

    67cj5 Member

    Oregon
    Joined:
    Oct 15, 2004
    Messages:
    348
    I am a self proclaimed Holley guru. I tried to tune a holley 600 on my dauntless. Way too big. I finally found a 390 and found it to be too small, I finally settled with a 450. Definatelty the best holley carb for this little motor. If you do get a 390 be careful, there are several different ones. There is one designed specifically for 4 cylinder motors and it wont run right on your application. Hope this helps
     
  6. Aug 2, 2005
    SandhillMike

    SandhillMike Moderator

    Archer, Fla
    Joined:
    Oct 25, 2003
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    246
    Thanks guys
     
  7. Aug 2, 2005
    jcandhis63

    jcandhis63 Member

    Hillsboro, TX
    Joined:
    Feb 6, 2005
    Messages:
    87
    67CJ5

    I could use a Holley guru. I have a 390 and a 450 that I would like to rebuild for my project. However, the primary throttle shaft in the 450 is pretty sloppy. I have seen kits with a reamer and bushing to tighten things up, but the kit costs almost as the carb.

    Do you know of a source for reasonably priced places to have throttle plates repaired or cheap bushings and reamers?

    JC
     
  8. Aug 2, 2005
    w3srl

    w3srl Semi-homeless in Florida Staff Member

    Port Orange, FL
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    Nov 6, 2002
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    3,958
  9. Aug 3, 2005
    jcandhis63

    jcandhis63 Member

    Hillsboro, TX
    Joined:
    Feb 6, 2005
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    87
    Thanks for the info.

    JC
     
  10. Aug 3, 2005
    oddfirejeeper

    oddfirejeeper Active Member

    Hamilton, MI
    Joined:
    May 5, 2004
    Messages:
    1,229
    i run a carter afb 600 cfm 4bbl carb on my v-6 on a 2 bbl intake and it works great but it does run a little rich so i need to calibrate it to run more effecient. but other than running a little rich i have no complaints about it at all.
     
  11. Aug 3, 2005
    jeepdaddy2000

    jeepdaddy2000 Member

    Eagle Point oregon
    Joined:
    Jun 24, 2004
    Messages:
    380
    The big plus to both of these carbs is that they run vac secondaries. This means that the secondaries won't flow more than the engine needs. The big thing I'v found with the V6 is the importance of the size of the primary side. Spread bore designs seem to work the best due to the small primary side bores. This keeps the pulses crisp in the venturi, allowing for good low end throttle response. I've run all the carbs mentioned in this post. The Holly 600n was the worst. I had good luck with the Edlebrock and the 450 Economaster. I'm curently running a Q Jet, and have found it to be the best of the bunch.
     
  12. Aug 4, 2005
    67cj5

    67cj5 Member

    Oregon
    Joined:
    Oct 15, 2004
    Messages:
    348
    Sorry i never got back to you, i didnt revisit this thread. i have sent them in mostly, but the last few I did myself at work. Alot of good sources out there
     
  13. Aug 4, 2005
    nickmil

    nickmil In mothballs.

    Happy Valley, OR
    Joined:
    Sep 23, 2002
    Messages:
    11,508

    11/32" valve guide liners for small block Chev heads works great on Quadrajets. Might check and see if it'll work on a Holley. Any local engine machine shop should be able to install them. Then just have to hone to fit your shaft. Done it a couple of times and works great on Q-jets. Nickmil.
     
  14. Aug 5, 2005
    jcandhis63

    jcandhis63 Member

    Hillsboro, TX
    Joined:
    Feb 6, 2005
    Messages:
    87
    Thanks Nick, sounds like a good thing to look into. I sure do like the creative engineering one can encounter on this site.

    Jim
     

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