As far as what years, they were as early as 97 and as late as 01 I believe. There is no vin code or specific year that they were in either. You will have to actually get out and look at the block to find out for sure. To add to that, a guy out here recently had the same cracking problem occur on his 55block, in the same place that it does on the 53block. There is a really good sticky at the top of the forum about 53blocks. Not all of them crack, and it has nothing to do with the amount of power either. I personally haven't seen very many of them. And none that had cracked.
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