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Thread: 6.2/6.5 Cylinder Block Date Code

  1. #41
    Join Date
    Aug 2014
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    Essendon Victoria Australia
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    10

    Default Assistance in dating my 6.5 engine block

    Hi there, I'm a new forum member and out if curiosity am after assistance in trying to ascertain production date for the 6.5l that was installed in my Nissan a Patrol/Safari late last year.

    The number on the block that I can see is 516 on both sides of the V. The engine number stamped into the top of the block at the front if the V is 700215.

    Any help appreciated.
    Phildo - Melbourne Australia
    2003 GU Nissan Patrol - Chev 6.5l Optimiser V8 turbo Intercooler diesel - Chev 4L85E Auto - 4.1 diff centre - BFG ATs - towing 2.5 tonne off road Trakmaster caravan

  2. #42
    Join Date
    Mar 2000
    Location
    South Central Pennsylvania, USA
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    Have a line on a block to pick up as a spare. Not too many details yet, trying to get a date code so I know more. But it is a 12555506 block and has this “GEP / AMG” sticker on the valve cover. Need to check date code and whether it has the “triangles” in the valley. Should I be hopeful that I’m going to find them? I know the 506 blocks spanned the end of GM production (which had issues) into the AMG blocks (which are great).



    Attached Images Attached Images
    Last edited by trbankii; 11-07-2014 at 13:52.
    '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

  3. #43
    Join Date
    Apr 2001
    Location
    Newberg Oregon
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    Default

    AMG BLOCKS
    Have the Diamond in the valley (Actually 2 triangles back to back)
    Date codes are found on the opposite side from the casting number

    xx xx letter

    The 2001 was the first real deal full AMG blocks and the letter is an H
    I was not used
    J is 2002 followed by K L M N O P etc

    The first 2 digits are the month followed by the second two digits for the day

    06 10 J = June 10th 2002

    The 506 casting number has remained the standard casting number since AMG took over the 6.5


    Good luck

    Missy
    (1) 1995 Suburban 2500 4x4
    (1) 1997 Astro
    (1) 2005 Suburban (Papa Smurf)
    THIS IS BOW TIE COUNTRY

  4. #44
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    Mar 2000
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    Yep, got all that from previous posts in this thread. I’m set to go look at it next Tuesday. I’ll report back on what date code and other information I find.
    '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. #45
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    Apr 2001
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    Newberg Oregon
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    Good luck on your quest

    Missy
    (1) 1995 Suburban 2500 4x4
    (1) 1997 Astro
    (1) 2005 Suburban (Papa Smurf)
    THIS IS BOW TIE COUNTRY

  6. #46
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    Mar 2000
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    South Central Pennsylvania, USA
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    Picked it up - triangles in the valley and date code of 01 21 *

    The * may be an H or N - outside possibility that it is an M…

    Have to clean it up a bit - and take it apart to see whether there are any issues inside.
    '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

  7. #47
    Join Date
    Mar 2000
    Location
    South Central Pennsylvania, USA
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    Ok, looking promising. Date code shows it as a 2006 and has the double triangles. I can turn it over, but I want to open things up to make sure that all is well inside the little beastie…

    Attached Images Attached Images
    '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

  8. #48
    Join Date
    Nov 2008
    Location
    So. Cal. USA
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    98

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    Quote Originally Posted by Robyn View Post
    M031 December 3 of 1991 is most probable
    The letters go from A being January through B C D E F and so on, I is not used as it looks like a 1 and ending with M being December.

    03 being the third day and the 1 being 1991

    Any and all 6.2 and 6.5 engines CAN have main line cracks.
    Some casting series were far more prone to it though.

    There is no way to predict if, when, which one or why.

    The crack subject has been beaten about for years here and on other forums.

    Metalurgy, stress risers that were not removed (Sharp edges) and on it goes.

    The real late blocks made by AMG after they took over are far better.

    The P400 6.5 is the gold standard. This engine has a complete built in girdle in the bottom end.

    The older 6.2 engines did not see as much cracking, but it did happen.

    Many of these engines will crack early in life and run a good long time without any issues, and the cracks are not discovered until the block is examined at rebuild.
    Old thread, I know. I never did figure out my date code if in fact this is my date code: F047. Would that be June 04, 1997? It's a 6.5 N/A that replaced a 6.2 before I bought it. It's also a GM Good wrench crate engine. Any good? Thanks for your reply.

  9. #49
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    Apr 2001
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    Newberg Oregon
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    The idea of "Any good" is subjective.

    If the engine runs good then it's OK
    If you are going to rebuild it....then it's a matter of checking out the block for cracks in the main webs and possibly the number 8 cylinder near the top rear for cracks

    What are your plans ?????
    (1) 1995 Suburban 2500 4x4
    (1) 1997 Astro
    (1) 2005 Suburban (Papa Smurf)
    THIS IS BOW TIE COUNTRY

  10. #50
    Join Date
    Nov 2008
    Location
    So. Cal. USA
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    Quote Originally Posted by Liftgate View Post
    Old thread, I know. I never did figure out my date code if in fact this is my date code: F047. Would that be June 04, 1997? It's a 6.5 N/A that replaced a 6.2 before I bought it. It's also a GM Good wrench crate engine. Any good? Thanks for your reply.
    Anybody? Help?

  11. #51
    Join Date
    Mar 2023
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    Pasadena, California, US
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    1

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    Quote Originally Posted by More Power View Post
    Good job! You win an official "attaboy".

    What can you tell us about the following number?

    Hello.
    The part number 10237141 for the GM 6.5-liter diesel engine cylinder block contains the following technical information:
    The first two digits "10" indicates that the part is related to the engine block.
    The next two digits "23" represents the model year of the engine, which is 1994.
    The following two digits "71" are a code that refers to the engine application, in this case, a 6.5-liter diesel engine.
    The final two digits "41" are a sequence number, which means it represents a unique identifier for the specific engine part.
    Overall, the part number 10237141 provides information about the engine block's type, model year, engine application, and sequence number, making it easier to identify and replace the specific part in case of any issues or required maintenance.

  12. #52
    Join Date
    Feb 2000
    Location
    Montana
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    Quote Originally Posted by JonyGurt View Post
    Hello.
    The part number 10237141 for the GM 6.5-liter diesel engine cylinder block contains the following technical information:
    The first two digits "10" indicates that the part is related to the engine block.
    The next two digits "23" represents the model year of the engine, which is 1994.
    The following two digits "71" are a code that refers to the engine application, in this case, a 6.5-liter diesel engine.
    The final two digits "41" are a sequence number, which means it represents a unique identifier for the specific engine part.
    Overall, the part number 10237141 provides information about the engine block's type, model year, engine application, and sequence number, making it easier to identify and replace the specific part in case of any issues or required maintenance.
    Thanks for the info, but:



    The above image of a GM 6.5 cylinder block casting code doesn't have the "71". And, I always thought the casting date code had it's own number on the opposite side of the bellhousing flange - either a 4-digit (GM) or 5-digit (AMG).

    Interesting stuff though... Jim

  13. #53
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    Feb 2000
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    Montana
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