The highly anticipated Corvette ZR1 has been the subject of countless rumors regarding its powertrain, leaving enthusiasts eager for concrete details. A potential breakthrough has arrived, thanks to a discovery in the GM Parts catalog, shared by the diligent community at the Mid Engine Corvette Forum. The revelation comes in the form of an entry for an “LT7” engine, described as an eight-cylinder gasoline powerplant with a 5.5-liter displacement.
The subsequent acronyms in the catalog entry provide valuable insights. “DI” denotes direct injection, while “VVT” signifies variable valve timing. Interestingly, “AFM,” which stands for active fuel management, is listed in the catalog but is reportedly not planned for the Corvette ZR1, similar to the existing LT6 engine. Sources suggest that the forthcoming LT7 is unlikely to incorporate cylinder deactivation technology. The leak, unfortunately, does not definitively confirm whether the engine will feature the flat-plane crankshaft used in the Z06.
Equally intriguing is the “M1K” codename attributed to the gearbox. This nomenclature differentiates it from the “M1M” utilized by the Z06, the “M1L” employed in the regular Stingray, and the “MLH” transmission found in the E-Ray. Given the anticipated power increase through forced induction, “M1K” suggests a more robust transmission capable of handling the additional power.
Rumors have swirled that the addition of twin turbos could elevate the Corvette ZR1’s output to an impressive 850 horsepower and 825 lb-ft of torque, potentially making it the most potent Corvette in history. However, this achievement might be short-lived, as Chevrolet is reportedly considering an even hotter Zora variant equipped with a twin-turbo hybrid V8 engine capable of delivering as much as 1,000 horsepower and 975 lb-ft of torque, according to a Hagerty report from early 2021. Additionally, with the confirmed development of a fully electric Corvette, the future looks incredibly promising for the American supercar.
Anticipation is building for the arrival of the Corvette ZR1, expected next year as a 2025 model year release. It is likely to command a significant premium over the Z06, which has a starting price of $112,700 for the 2024 model year.
