Yes "LSx" is used to identify the whole series of engines. It is also used to identify the custom built crate engines, due to the fact that most of them don't really fit into one of the predetermined LS* names. They can be virtually any displacement, with a mixed grab bag of heads, cam, intake manifold, etc.
I am personally a fan of the LS2. Chevy took all the good from the LS1 and the LS6 and combined them to create the LS2. 6 liters of bad-assery.
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