The engine has some type of non aluminum sleeve for strength. With different fuels, such as 100 octane, c16, or e85 the hp could be bumped up considerably.
I think one of the major points of the announcement was that on gas available at the pump(91octane), they were able to make over 1000hp. quite an accomplishment. Demonstrates the greatness of the LS series of engines and lots of talent from the builder. Bang for buck GM rules.
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