I'll add to that...
The 01 model year got the LS6 intake to add another 5 hp over the year before.
Quote:
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Beginning in 2001, the LS1 received the higher-flowing intake (from the LS6), and a smaller camshaft to keep power at the same level; this also allowed GM to remove the exhaust gas recirculation (EGR) system (Camaro/Firebird only; 97-00 Corvette LS1 never used an EGR system). The block is very similar to that of the higher-output LS6; beginning in 2002, some LS1 engines were actually built using the LS6 block instead. The LS1 was on the Ward's 10 Best Engines list for 1998.
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It's from wikepedia..take it for what you believe. But, I am certain (in my mind) that it was only the last of the 02's that had the LS1 blocks w/ LS6 heads.