I would like to verify my block type by its casting #. My truck is running fine, it's just for my own interest. I have a Haynes manual and it describes 2 locations on the block which they refer to as engine identification #'s, however the break-down of this # does not seem to provide any info on the casting # of the block. Could someone tell me where the casting # is located, and how many digits are in the number? From my reading it appears that these cast #'s are 3 digits, however are they found within a larger number? Also, can this # be observed with the engine in and all the parts in place, or will I have to remove something in order to see it. Sorry if this has been asked before, however I couldn't find it in a sticky or in my search under block casting number. Thanks.