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No, LS3 heads need offset rockers on half the valves. Couldn't tell you about the injectors but I doubt anyone else can either because nobody here knows what vehicle your putting them on.(yr/mdl?)
Well I'm doing a 6.0 lq4 swap in my rcsb silverado 04 I have the complete engine came out of a 06 2500hd and I'm doing the ls3 heads and intake manifold but the heads I bought came with no rockers