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225 Odd-Fire??

Discussion in 'Early CJ5 and CJ6 Tech' started by ptjsk, Dec 26, 2012.

  1. Dec 26, 2012
    ptjsk

    ptjsk New Member

    Northern CA
    Joined:
    Oct 23, 2010
    Messages:
    16
    Hello,

    I'm trying to determine the v6 motor that's inside my '71 CJ5 Jeep.

    The casting number on the block is 991556. I have yet to locate a source for this casting number. I have seen 991503 identified as a '67-'71 block, but again nothing for 991556.

    I went down to the machine shop and now that the block has been boiled and cleaned, I can now read the numbers 991503 on it. I mis-read the numbers in my previous post.

    Thanks to all who took the time to offer me assistance!

    Have any of you guy's run into this?

    Also, the PVC valve is located in the valve cover and is not on the intake manifold. Sources of information states that this is a 225 Odd-Fire. Would this be correct?

    Thanks
     
    Last edited: Dec 27, 2012
  2. Dec 26, 2012
    Jamco6000

    Jamco6000 Member

    Baton Rouge, LA
    Joined:
    Apr 14, 2012
    Messages:
    211
    This is the only thing i could find but it doesn't look like much help
     
  3. Dec 26, 2012
    tarry99

    tarry99 Member

    Northern California
    Joined:
    Oct 29, 2012
    Messages:
    3,784
     
  4. Dec 26, 2012
    jpflat2a

    jpflat2a what's that noise?

    Hermosa, SD
    Joined:
    Jul 30, 2003
    Messages:
    8,516
    The EGR would be attached to the intake manifold a la 231; the 225 never used an EGR valve.
    The PCV valve is located on/in the valve cover.
     
  5. Dec 26, 2012
    ptjsk

    ptjsk New Member

    Northern CA
    Joined:
    Oct 23, 2010
    Messages:
    16
    Thanks Guys!

    and you're right, it is the PCV valve not the EGR. Thanks for pointing that out to me.
     
  6. Dec 26, 2012
    Twin2

    Twin2 not him 2024 Sponsor 2023 Sponsor 2022 Sponsor

    Virginia Beach, VA
    Joined:
    Apr 28, 2011
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    5,415
    quick sure fire way is to remove oil filler cap on valve cover and look and see if it has a rocker arm shaft . if it does it a 225
     
  7. Dec 26, 2012
    nickmil

    nickmil In mothballs.

    Happy Valley, OR
    Joined:
    Sep 23, 2002
    Messages:
    12,529
    Both 225's and 231's used a rocker arm shaft.


    Sent from my iPhone
     
  8. Dec 26, 2012
    Zoomer

    Zoomer eJeeper (walking)

    Minnesota
    Joined:
    Sep 22, 2002
    Messages:
    1,092
    Cast vs stamped rockers?
     
  9. Dec 27, 2012
    Warloch

    Warloch Did you say Flattie??? Staff Member

    Falcon, CO
    Joined:
    Mar 4, 2003
    Messages:
    5,469
    Pull the pan and look at the crank if there is any question. Might take a bit longer, but you will know for sure.

    Not a 225 crank, but it helps to have pictures of an OF Crank for the journals:
    [​IMG]

    Even Fire Crank - Notice the split in the journals.
    [​IMG]
     
  10. Dec 27, 2012
    ptjsk

    ptjsk New Member

    Northern CA
    Joined:
    Oct 23, 2010
    Messages:
    16
    Thanks a heck of a lot guys!

    This has definitely helped me!

    I did go back down to the machine shop, and now that the block has been boiled and cleaned, I can now read the casting #991503!! Makes a lot more sense now!

    Also, the good thing I found is that the motor does appear to be original '71 that has never been bored, and probably never has been opened up before. The rod bearings, once removed still have the GM stamp on them.

    Looking forward to getting it back and preparing for placement back into the Jeep!

    Thanks again for all the help!

    Pat
     
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