MonsterZ28

Was it 2000 or 2001 when gm started using the ls6 block instead of the ls1 for camaros

Switchblade

I believe it was late 2002 when GM used the LS6 engine block, and it was used on some f-bodies

NOSjohn

iTrader: (9)

I believe JRP has the answer to this in one of the links in his signature. Check it out.

It's very possible that GM started production for the LS6 early in 2000 for the 2001 Z06, so some may be stamped with a Sept-Dec 2000 code.