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Using a F/L-head with new gas forumlations?

Discussion in 'Early CJ5 and CJ6 Tech' started by LostDawg, Aug 15, 2007.

  1. Aug 15, 2007
    LostDawg

    LostDawg Slowly rusting in the NW

    Longview, WA
    Joined:
    Sep 24, 2006
    Messages:
    300
    I couldn't help but notice the minimum fuel octane rating of 68. How do these older engines handle todays lead-free, 87 octane fuel? Do they require rebuilding the head to handle todays gas, or do the owners use a lead substitute added to the gas?
     
    LostDawg, Aug 15, 2007
    #1
  2. Aug 15, 2007
    sparky

    sparky Sandgroper Staff Member Founder

    Perth, WA
    Joined:
    Sep 20, 2002
    Messages:
    9,221
    Re: WW II Reconditioning Program?

    :? Not that it's an invalid question, but what does it have to do with remanufacturing Jeeps during WWII?

    I'll put it in one of the tech sections when I understand the reason behind this post and know where it should be. :beer:
     
    sparky, Aug 15, 2007
    #2
  3. Aug 15, 2007
    LostDawg

    LostDawg Slowly rusting in the NW

    Longview, WA
    Joined:
    Sep 24, 2006
    Messages:
    300
    Re: WW II Reconditioning Program?

    (Don't bother Sparky, I was just reading through this thread and it just popped in my head when i saw the reman. tag, sorry. Why not just delete these and keep the thread clean.) :beer:
     
    Last edited: Aug 15, 2007
    LostDawg, Aug 15, 2007
    #3
  4. Aug 15, 2007
    sparky

    sparky Sandgroper Staff Member Founder

    Perth, WA
    Joined:
    Sep 20, 2002
    Messages:
    9,221
    Re: WW II Reconditioning Program?

    It's no problem, it just really threw me for a loop, it wasn't what I expected to see when I saw the thread finally had another reply. R)
     
    sparky, Aug 15, 2007
    #4
  5. Aug 15, 2007
    jpflat2a

    jpflat2a what's that noise?

    Hermosa, SD
    Joined:
    Jul 30, 2003
    Messages:
    8,526
    I don't think it matters that much...
    some daily driver guys might add the lead substitue
    weekend Jeepers prolly not
    I do when driving on a long trip.
    FWIW
     
    jpflat2a, Aug 15, 2007
    #5
  6. Aug 15, 2007
    blevisay

    blevisay Oh Noooooooooooooooo! Staff Member

    Portland Tn.
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    Sep 20, 2002
    Messages:
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    search?
     
    blevisay, Aug 15, 2007
    #6
  7. Aug 15, 2007
    bkap

    bkap Gone, but not long gone.

    Tucson, AZ
    Joined:
    Sep 9, 2006
    Messages:
    784
    Heads can be converted by putting in hardened valve seats. Not that big a deal for a good machine shop. Probably worth the trouble even if you have to pull the head. You might even be able to reuse the old valves. That's one advantage to working on the old iron, easy accessibility. What? Thirty minutes or less to get the head off if you take your time?
     
    bkap, Aug 15, 2007
    #7
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