New Corvette Grand Sport Could Debut With a 6.7-Liter V-8: Report

General Motors is spending a boatload of money on a sixth-generation small-block V-8 engine. That new motor will power an assortment of vehicles, including the Chevrolet Corvette. It should also come in two sizes, which means the company’s iconic sports car could get an even larger engine.

According to a new Corvette Blogger report, citing information from GM’s Parts Book and “a person close” to the automaker, the sixth-generation LS6 engine will have 6.7 liters of displacement—409 cubic inches. That new engine will likely upcoming 2027 Corvette Grand Sport.

The report shares an image from the Parts Book that labels the engine as aluminum with overhead valves and direct and port fuel injection. Previous rumors suggested GM would use the smaller engine, a new 5.7-liter unit, in vehicles like the Chevrolet Silverado 1500.  

The larger engine will allegedly power the Corvette, which GM will tune for power and performance. We’ll also likely see the 6.7-liter V-8 power a future version of the Cadillac CT5. The CT5-V Blackwing is a performance monster that could use a bigger engine and more power.  

The Iconic Small-Block

GM introduced the fifth-generation small-block V-8 in 2013. The sixth-generation engine will start arriving in GM’s full-size pickups beginning in 2027 before rolling out to other models. In 2023, GM announced that it would invest $579 million at its Flint Engine Operations to build the sixth-gen V-8, and earlier this year, the company invested even more money.  

GM is promising that the new engines will provide more power than the current lineup. The current 5.3-liter V-8 makes 355 horsepower and 383 pound-feet of torque. The larger 6.2-liter engine produces 420 hp and 460 lb-ft, with the supercharged version making as much as 682 hp and 653 lb-ft.  

The increase in power won’t hurt efficiency, either, according to the automaker. It’s also unclear if GM will pair the engine with any form of electrification. While the automaker is pulling back from some of its electric vehicle efforts, hybrids are only growing in popularity, and we expect some vehicles will feature electric assistance.