Do you still have the EGR functioning right now? If so, the LS6 manifold does not have EGR provision so you would need to block off the EGR and tune it out. Regardless of the EGR, you might need a retune due to the added airflow but it should run.
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69 Z28 JL8 4 wheel disc brakes - being restored
09 Silverado Z71
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