Friend of mine went through 3 GM crate LS6's in the 80's before he got one that lasted. The first 2 ate lobes off the camshaft within 200 miles. They warrantied them. 3rd time was a charm.
He later bought a crate LS7 from another friend of mine that bought it new and just left it in the crate. This was about 10 years after the fact and all the horror stories were already circulating. He decided to tear that one open and found loose rod bolts that weren't torqued to spec. That engine would have lived a very short life if run as it was. He checked over the entire engine and buttoned it up. It ran fine for years after.
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