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LS2 heads are LS6 heads. They are the same casting. Sometime different numbers. the 02-04 LS6 heads have the special valves. Check the casting numbers either 243 or 799 if memory serves me right. Same flow rate.
From what I am reading online they are from the 6.0l and have a larger combustion chamber. Not sure if they would increase performance or just make lower compression.