![]() Generally, if it was going to suffer cracking it will show signs of it by the time is makes it to a "worn out" rebuild vice a catastrophic failure death. Now if you do find one that is not "euchred" by now, it's probably a fine candidate for a stock power level rebuild. Someone even posted up once where it had cracked around the head bolt holes. GM castings seem to crack everywhere: main cap bolts, Cap registers, oil cooling jets, cylinders, heads, starter mounts, etc. The later years are actually worse than the early years.Ĭasting numbers are you best bet to find a good one.ĥ99 castings are reported to be the best, but I've had one that cracked in the cap registers, so no guarantees.ĥ06 castings are generally agreed to be the worst, a lot having to do with the tooling errors when making the piston oil cooling jets in the main webs. All of the GM castings are suspect for the cracking issue.
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