I am pretty sure a 55 is a good one..

 

Mine 99 is a 53 block but I figure I'll just grind off the 53 and it won't crack. <br><br>Living in Indiana there's plenty of 5.9 blocks around these parts. 8) Plus Cummins is just up the road a peace so I think I could find a block if I had to.<br><br>DB

 

Every one I know personally have the 53 blocks,I cannot believe Cummins kept building them if they knew there was problems..

 

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Mine has 55 in the block. Where is this one from? It is a replacement from my cracked one.

Mike
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55 is the thick one. You won't have any problems.

Semper Fi
USMC 1969-1971

 

Thanks Pit Bull.<br><br>Oorah Marine Corps!<br><br>Mike

 

I'm just curious if these block numbers have anything to do with geography. I've been shopping for a 24V here in Phoenix and looked under four trucks in a row tonight. A 99, 01, and two 97's 12Vs out of curiosity. Every single one had a 5 digit block code (smaller than the 1 inch tall 53 etc that have been discussed and located level with the harness front driver's). From the sounds of things the 53 seems to be a very widely distributed block. Strange that the first four trucks that I climb under have the five digit code. Well, I'm going to look at the truck I'm most interested in tomorrow... Hopefully I can keep the winning streak going ;D.