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01 LS6 was the first 243 heads, also used on the LS2 with solid ex valves while the 02-04 have sodium. The springs are good for higher lift on both LS6 then the LS1 and all LS1 after 2000 (2001+) have the LS6 intake. There are changes in the block too and there is a good write up on it somewhere, o yea, hot rod magazene few back... Good luck!
Dave
My understanding in the difference of the LS1 and LS6 with those mentioned already is the LS1 has weaker rod bolts. I have an LS1 with the 2002 LS6 heads , cam and intake along with other MODS
My signature shows my RWHP/RWTQ with these bolt ons.
SC5