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

225 Odd-Fire??

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

  1. ptjsk

    ptjsk New Member

    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
    ptjsk, Dec 26, 2012
    #1
  2. Jamco6000

    Jamco6000 Member

    This is the only thing i could find but it doesn't look like much help
     
    Jamco6000, Dec 26, 2012
    #2
  3. tarry99

    tarry99 Member

     
    tarry99, Dec 26, 2012
    #3
  4. jpflat2a

    jpflat2a what's that noise?

    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.
     
    jpflat2a, Dec 26, 2012
    #4
  5. ptjsk

    ptjsk New Member

    Thanks Guys!

    and you're right, it is the PCV valve not the EGR. Thanks for pointing that out to me.
     
    ptjsk, Dec 26, 2012
    #5
  6. Twin2

    Twin2 not him 2024 Sponsor 2023 Sponsor 2022 Sponsor

    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
     
    Twin2, Dec 26, 2012
    #6
  7. nickmil

    nickmil In mothballs.

    Both 225's and 231's used a rocker arm shaft.


    Sent from my iPhone
     
    nickmil, Dec 26, 2012
    #7
  8. Zoomer

    Zoomer eJeeper (walking)

    Cast vs stamped rockers?
     
    Zoomer, Dec 26, 2012
    #8
  9. Warloch

    Warloch Did you say Flattie??? Staff Member

    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]
     
    Warloch, Dec 27, 2012
    #9
  10. ptjsk

    ptjsk New Member

    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
     
    ptjsk, Dec 27, 2012
    #10