So I got this bare gen 4 6.0 block for free from my roommate who bougbt it it as a pacjage deal with sime other things. Problem is the guy doesnt remember what it came out of or what year either. Ive researched the casting numbers and have found nothing ither than the numbers in front of the passenger head tell you month/day/year was produced but this doesnt begin with a letter like the others.

Rear of block 12610679 AA
Front of block looks like 31806

Id like to know what it is so I can plan a build accordingly but if all gen 4 6.0 iron blocks are the same I may not worry about it.

Front of block

Rear of pasdenger side

Front of passenger head Sorry best shot I could get on my phone

 

they are all the same