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Power difference is probably negligible. Usage would be the main reason. BBK has the EGR provision and cast aluminum is probably better for NOS. LS6 is lighter. If the LS6 had the EGR I would be grabbing one. LPE used to sell a fitting to glue to it and SLP puts that plumbing piece in but I don't like that setup as much.
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69 Z28 JL8 4 wheel disc brakes - being restored
09 Silverado Z71
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