Block Identification

[Aftermath]

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

The numbers are: 12555506 and L136

Any help is greatly sppreciated

[DmaxMaverick]

December 13, 1996.

[Aftermath]

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

Thanks

[trbankii]

Lots of information in the "date code" sticky: https://www.thedieselpageforums.com/tdpforum/showthread.php?t=24325

[Aftermath]

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.

[More Power]

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

[Robyn]

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.

[Aftermath]

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