I have seen ls7's after a season on e85 and the pistons were fine. Very clean, too! On a stock c6z, with just a tune and e85 in the tank you will gain about 20whp or so and lose a couple mpg from what I have seen others do. I know the Nissan isn't a Chevy, but aluminum pistons are aluminum pistons, etc. The only research I did on e85 was as relates to my vette, and noone I know of in the c6 community has had any side effect from running it except a cleaner engine, more power, and a few mpg less.
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