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[No Doubt]

All engines are balanced and "blueprinted" to a degree. When one uses the expression "balanced and blueprinted" in a performance engine building sense, they are referring to the fact the process is more carefully controlled and the tolerances called for in the original design (the blueprint) are more closely adhered to. When rebuilding an engine the tolerances are checked to insure they are in accordance with the original "blueprint" and if not are corrected so they are.

But yes, the LS7 is spun "balanced" at the factory and each rotating assembly part is weighed and kept within a given tolerance for that part. Again, as are all new engines.