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I had a slight cam lope in my 2016 SS with the M6 and definitely my LT4 doesn’t have a smooth idle either. It’s the nature of the LT1 and LT4 engines. Don’t think you have anything to be concerned about as long as the car runs good and no CELs pop up! Enjoy the 455 hp and I would put the best gasoline(top tier) of at least 93 octane. I used Shell V-power when I had my SS and alternative between Shell and Chevron in the ZL1. Of course the octane available depends on the region of the USA where you live.
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ZL1 Coupe, PDR, Exposed carbon fiber hood insert, My Link with Nav, M6 6 speed and Silver Ice Metallic. Mods done: ceramic window tint, GM Accessories Camaro floor mats and Roto-Fab CAI.
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