Hennessey mentioned his plan to tune Corvettes." He would have two different packages. Apparently, both were in the planning stages at the time. Vetter’s Vette became the first Z500, and is so denoted on the valve covers as #001. Later, there will be a Z600. The former is a heads and cam package. The latter is a stroker engine in a Stage 2 configuration.
    As the Z letter indicates, the basis for this super Hennessey Corvette is the Z06. Jon Paul recalled, "I was considering a Viper, having looked at both Vipers and Corvettes. Then I found out the Z06 has very comparable performance, in stock form, to the Viper."
    Vetter’s Z06 ran a 12.42/114.24, bone stock. This is comparable to a Viper, but the Hennessey tune would push Vetter’s Z06, now a