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428 block ID help

Discussion in '1965-1970 Shelby Mustang GT350 & GT500' started by firestanggt, Jul 24, 2011.

  1. Jul 24, 2011 #1
    firestanggt

    firestanggt Well-Known Member

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    I have what I believe is a 428cj block. It had the correct rods and crank for a CJ. It did have solid lifters but I'm quite sure that was done later since it has all 3 oil galley plugs in the back. From what I have read, there was not a part number on these later blocks like the earlier ones had. Is that correct?
    What really had me confused is the date code. I have attached a couple pictures. I can't make out the year. I looks like a P or an R which doesn't make sense either way. There are also a couple numbers on the side of the block which I have in the last picture but I don't believe that they are important.

    Thanks
     

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    firestanggt, Jul 24, 2011
    firestanggt, Jul 24, 2011
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  2. Jul 25, 2011 #2
    Coralsnake

    Coralsnake Well-Known Member

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    1969 and 1970 blocks have two dots cast under the first number. Most likely this is "9L3" or a November 3, 1969 cast block (1970 model year). If it is for a CJ car, you have a pretty small window of cars it could fit into.

    :cigar:
     
    Coralsnake, Jul 25, 2011
    Coralsnake, Jul 25, 2011
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  3. Jul 25, 2011 #3
    firestanggt

    firestanggt Well-Known Member

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    Thanks
     
    firestanggt, Jul 25, 2011
    firestanggt, Jul 25, 2011
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