Watch: The ZR1 Lands at the Hennessey Shop by Sebastien Bell August 8, 2018 Share Comments The Hennessey portfolio is a litany of four-digit horsepower figures and ridiculous upgrades. So a production car has to be truly special to impress the staff. Fortunately for all involved, the Corvette ZR1 is a truly impressive machine. With 755 hp, 715 lb-ft of torque, and a verified top stop of 212 mph, even the guys at Hennessey are impressed. Still, they can’t help but think about how to improve it. The LT5’s stronger internals just make them want to get more out of the car. Something they’re already hard at work on with the HPE850, the HPE1000, and the HPE1200. Point for guessing what those numbers mean.