Very interesting my 04 LS6 block uses the LS2 rear cover and shorter LS2 head botlt or studs, in my case i am using the shorter ARP head studs,

I am hearing there was a revision in or around 2004 , that the LS6 5.7 blocks changed. Using now the LS2 rear cover and shorter head bolts,

are there any other differences?
are these blosks any stronger??

 

are these blosks any stronger?? <--no! ls1/ls6 same stength block. I know that the LS9 block is 38% stronger than the ls2 thoe.

 

whats a blosks?

 

wrong ls1's dont have the bay to bay breathing holes cut in to the block but the ls6's do the ls1's 97 through 99 or 2000 blocks are different than the later 01-02 ls1 blocks they had a camshaft oil passage revision and the later ls1's are supposed to be able to handle more power than the earlier ones because of this and some more material being added in that area making the block stronger so to anwswer your question the later model ls1's are stronger than the ls6

 

I think my 04 LS6 block has this camshaft oil passage revision to