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sorry to tell you man but i had the same set up u have ls with pistons and bored out to 81.5 and guess what happen at 20 pounds of boost with the best tuner in va. fucking sleves cracked. ls are the best only if they are sleved they make crazy power when sleved.ls are weak when it comes to stock sleves speecially when they are bored out.i have my ls bored to 81.5 sitting on my backyard cracked. but good luck on ur sale