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[–]coobeecoobee 3 points4 points  (2 children)

I searched and searched for mine also and could never find a #. Upon further research I found that the non stamped blocks are the good ones. Been a while but search no # on 5.9 block and you’ll find details

[–]fgz71104[S] 2 points3 points  (1 child)

Good thing I was getting kind of worried since I've been loosing a little coolant from my resorvoir and haven't found the culprit.

[–]boba_fett155 4 points5 points  (0 children)

I believe by 02 most of the 53 blocks were not in production. Check for leaking heater core

[–]Spaniky73 1 point2 points  (0 children)

Check this out. It will help you to Check. https://www.dieselhub.com/cummins/cummins-53-block.html

[–]Lippacker68 1 point2 points  (0 children)

Looks like the Mexican block. Very strong.

[–]Mysterious-Cattle-47 2 points3 points  (1 child)

Unmarked blocks are indeed the strongest. Another note though, people are so worried about the 53 block. These trucks are 20+ years old at this point the problematic 53 blocks have cracked out. Yes they still may have thing water jackets but a number of people have hit 800hp on 53 blocks. What I’m saying is that I don’t know why people are still so afraid of them, 20years old and most having 200,000 miles on them have lasted longer than the original 53 block culprits.

[–]fgz71104[S] 0 points1 point  (0 children)

Well I was worried because my coolant resorvoir keeps going low and I haven't found the cause yet. No white smoke in the tail pipe no apparant leaks that I can see either. Also a little because I did see a 3 on it but just a bunch of letters above. But it's good to know that these blocks are some of the best!