I know where cummins usually stamped the casting code on the sides of the block just above the oil pan as I have found the "55" on my 2000 dually but i just bought a 99 2500 and I was sure it would have the dreaded 53 block in it but I cant find a casting code on it? It is a mexican build dodge Saltillo MX I think so does that give it a good chance at not having a 53 block?