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The engine powering the 789 is the 400hp LS2. By the time you see this, Chevy will have upped the power ante to 430 hp on next year's base LS3 Corvette engine, and thus all production 789s. Due to the prototype nature of this 789, N2A declined to let us photograph the engine compartment, citing its "rough" appearance. Mechanically, it's all factory C6, though.