Cummins Block #'s

[Got Twins???]

Alright fella's quick question. Currently own a 99 Dodge equipped with a fairly well modded 24 valve 53 block. 220k on it and no cracks. However looking to build a motor with a lot more power so despite my luck I want to get away from the 53. I heard that the out of the 2 24valve Mexican blocks they used in 02 there is one that has a longer ID# that is the heavier block. I think I might have found one but the numbers we're seeing on the block don't seem to be amounting to anything. Then again maybe I'm doing something wrong. Anyone got any advice which would help find out anything about this block, year, class, etc.???? :bang

 

[kjpcummins]

i have an 2002 and has a #56 block the heavy mexican block will have alot of small numbers and letters three or four lines from the pic i saw instead of just have the two single numbers like 56

 

[kipo]

here's the numbers off my mexican 01'

 

[Got Twins???]

Thanks a lot for the responses. The pictures were a huge help. I knew about the one having 56 stamped on it but I wasn't sure where to look for the longer set of numbers on the other one or what they would look like. Thanks again to both of you.:kick: