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In a way yes but how much don't know. A true LS6 head had lighter valves, stronger springs. The casting number was 243 the LS1 is a 241. You can benifit with LS6 heads they offered better flow intake and the exhaust side and higher compression 10.9 I think. I can't tell you how much of a gain you would see because the LS6 had a cam that worked with the heads. Also I don't know for sure that some LS6's came with shorter or longer valves to work with the small base circle cam, so the correct pushrod lenght is requred.
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