chrisp
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Floating sleeve block in LS so no problems there.
I don’t think the liners in the LSx are floating, but rather they are cast in place.
Some early variations of the LSx engines were notorious for having poor liner placement (or the liner shifting during casting?) and it wasn’t uncommon to breakthrough the liner when reboring the block. I believe the latter engines (including the LS3) are much better in this respect.
Personally, I think it takes a very good engine builder to produce an engine of OEM quality. On a factory production line, parts can be graded and selected to suit the particular block as it is assembled. For example, Nissan had six sizes of the ‘standard’ piston with sub-thou size variations in the RB30 as used in the VL.