The most powerful production Corvette with an internal-combustion engine debuted in the summer of 2024 as a 2025 model, but the real numbers have surfaced only now.

A low-mileage Corvette ZR1 went on Hennessey’s dyno and put down 1,051 horsepower at the wheels, topping Chevrolet’s official figures.

Peak power was recorded at 6,960 rpm, while maximum torque reached 821 lb-ft as early as 4,810 rpm—noticeably sooner than stated. The car remained completely stock, including the ZTK Track Performance package with carbon wheels, Michelin Pilot Sport Cup 2 R tires, and a sizeable rear wing.

The only ‘change’ was Hennessey’s own decal, a neat reminder that General Motors baked in the headroom. That matters in light of rumors about a possible H1200 package that could lift the ZR1 to 1,200 hp without radical hardware surgery. Even in factory trim, the ZR1 tops out at 375 km/h, and by the price-to-performance metric it looks singular.

Even with a base price around $185,000, it sits next to a Porsche 911 Carrera GTS on cost, yet in sheer pace and output it plays in the realm of far pricier European exotics. For a fresh production model, it’s one of those rare moments when a street car brushes the border of the hypercar class.

The C8-generation ZR1 makes a clear point: American engineers are once again operating at full tilt, leaving little breathing room for rivals. Real-world output beating the spec sheet is the highest compliment to the powertrain and its dependability. And if Hennessey does roll out a 1,200-hp version, the supercar field will have a deeply uncomfortable new rival.