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Date code on engine block question

Lazboytt

Member
178
7
18
Location
Michigan
Hello,
Finally had the doghouse off again to see the date code on the block. Trying to figure out the code. If I’m correct I believe it’s a 6.5 November 4th 1999. Is someone able to confirm? Also is this a decent block? I’ve heard there are some blocks that were known to be bad during a certain production year. The person I purchased it from said it was a 6.5 and was optimized.

12555506 with K049

Any thoughts?
 

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86humv

Well-known member
Steel Soldiers Supporter
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Location
Texas
I don't think they use I...so oct.4 99....GM block, not GEP optimizer.
 
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