I'll add to that...
The 01 model year got the LS6 intake to add another 5 hp over the year before.
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.
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.