How to find an IH cast 5.9 block

my block came from a 94 auto.

i heard that they were cast and machined to tighter specs because cummins inspected them closer. cummins could not risk having lesser quailty part.


Tighter than what?
 
Have one in my '97 without an IH head. The engine going in my fummins is an IH block and head out of a 1995. Both manual trans trucks.
 
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