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a friend of mine was telling me i had a bull's eye on my block and said i had the LS6 block.. its a 2001 ss
If it has xxxxx1168 casting numbers at the left rear of the block right at the deck just below the head gasket, it's an LS6 block (might need to use a small mirror on your car).
LS6 blocks started being used from 2001.
Mines a Dec 2001 build and had an LS6 block.