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Thread: Block Identification

  1. #1
    Join Date
    May 2014
    Location
    us, ga
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    166

    Default Block Identification

    So I bought a 6.5 block that I think is a 1997??

    The numbers are: 12555506 and L136

    Any help is greatly sppreciated

  2. #2
    Join Date
    Apr 2001
    Location
    CA
    Posts
    13,573

    Arrow

    December 13, 1996.
    1985 Blazer 6.2
    2001 GMC 2500HD D/A
    dmaxmaverick@thedieselpage.com

  3. #3
    Join Date
    May 2014
    Location
    us, ga
    Posts
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    Default

    Is it a good block? How does it fair as a 6.5? Squirt block?

    Thanks

  4. #4
    Join Date
    Mar 2000
    Location
    South Central Pennsylvania, USA
    Posts
    2,697

    Default

    Lots of information in the "date code" sticky: https://www.thedieselpageforums.com/...ad.php?t=24325
    '94 GMC 6.5TD K1500 4L80E 2-Door Yukon SLE 221K
    '93 Chevrolet 6.5TD K2500HD NV4500 Std. Cab Longbed 187K
    '85 Toyota 22R RN60 4x4 Std. Cab Shortbed 178K (Currently retired for rebuild)
    Diesel Page Member #2423

  5. #5
    Join Date
    May 2014
    Location
    us, ga
    Posts
    166

    Default

    I did read through the thread, and think this block was prone to cracks but cant zero in on exactly what I have. Squirt or no squirt. I'm assuming that if no cracks, it's a good block. I'm told that it was running fine when it was pulled.

    Any information is greatly appreciated.

  6. #6
    Join Date
    Feb 2000
    Location
    Montana
    Posts
    11,382

    Arrow

    Late 1996 and early 1997 model year saw the introduction of the piston oil spray blocks. There was a fairly narrow window of near catastrophic failure percentages.

    The non spray blocks were equipped with 1/2" oil cooler lines and the spray blocks got 5/8" lines.

    Jim

  7. #7
    Join Date
    Apr 2001
    Location
    Newberg Oregon
    Posts
    12,282

    Default

    All 6.5 blocks can crack at the various places in the bottom end web area in the middle 3 webs near the bolt holes.

    Late GM blocks had issue near the top of the number 8 cylinder bore as well.

    The only "Good blocks" are the ones made by/for AMG

    2002 and later were/should be the good stuff.

    This said...If you have a well seasoned block that is crack free you should have a good foundation to build on.
    (1) 1995 Suburban 2500 4x4
    (1) 1997 Astro
    (1) 2005 Suburban (Papa Smurf)
    THIS IS BOW TIE COUNTRY

  8. #8
    Join Date
    May 2014
    Location
    us, ga
    Posts
    166

    Default

    Gotcha, thanks for the info y'all!!! ]

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