Z500, easily ahead of the V10-powered Dodge sports car. Jon Paul also feels he’s in a league with Venom 550 and Venom 600 Hennessey Vipers.
    The Z500 top-end kit includes "heads, cam, headers, exhausts, cold air intake, a modified mass air flow sensor, and a custom computer program," according to Jon Paul. Although complete specs have not been released at this time, the head work features larger valves and extensive port work for high flow. Vetter says his Hennessey-modified LS6 heads flowed 318 cfm, which is "serious air." Exhausts on his Z500 are ceramic-coated Belangers, with 1 3/4-inch primaries, emptying into B&B PRTs.
    The result of Hennessey’s tuning gives solid meaning to the Z500 name. If Z traces heritage to Z06, the 500 has much to do with dyno readings. Vetter’s Z500 dynoed at