LS7 main bearing problem

[JETSET700]

Does anyone know about mains having to tight of clearance on new LS7 crate motors? A local dyno place told me I might be smart to check main clearance on my unfired motor! He showed me the block and crank with seized bearing fused to the journal. It was the middle bearing as with others he knew of. Any feedback appreciated especially any GM people out there.
I'm concerned about warranty issues as time from purchase to running the first time can get long.

Peter Stewart

[XcYZ]

I've read how a few guys have had bearing score issues, but from what I've seen, it's not common... but it's something to be aware of for sure.

[4mm]

IMO it's not a common problem at all considering all the LS7's on the road today. Something can always go wrong with ANY engine with the production numbers of the LS7. It is a stout engine, just follow the recommended maintenance on it by the book.

Having said that, if it is a crate engine, it is a small amount of work to check the bottom end just for peace of mind.