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Originally Posted by AbadR1
Thanks for the suggestions guys. So if most block code name "z" will crack mostly before 30k? So if the H1 is more than 30k, does it mean it has been either replaced or just lucky it has not been cracked?
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It doesn't mean it will crack. Just saying that it can crack.
The worst years were basically 1997 and 1998. During 97/98 about 1/3 were affected.
Each engine does have a casting number, if you read up on Chuck's site he'll have listed the old casting numbers and new numbers.
http://www.flashoffroad.com/Diesel/N...ackedBlock.htm
30k is not the end-all number, merely a guide. I'm sure there were more than a few that cracked above 30k, but it seems that most that cracked, cracked with less than 30k.
If the VIN has a Z as the 4th character, you may have a flawed engine. The updated blocks with F as the 4th character came out in late 2001.
6.5L N/A engines didn't seem to have this problem, those have a Y as the 4th digit of their VIN.