GM readies 2027 Small Block V8s: new 5.7 and 6.6 for Silverado, Sierra and Corvette
A. Krivonosov
GM prepares its 2027 Small Block V8s: a fuel-savvy 5.7 and a 6.6 for performance, heading to Silverado, Sierra and Corvette with DFM and 520+ hp rumors.
General Motors is preparing to roll out a new generation of its legendary Small Block engines. The sixth iteration is slated to debut in 2027, first in the light-duty Chevrolet Silverado and GMC Sierra pickups, as well as the Corvette C8. The lineup will open with a 5.7-liter V8 focused on fuel efficiency and a 6.6-liter variant built for heavy workloads and sports-car duties. The pairing hints at a strategy that blends nostalgia with modern pragmatism.
The new 5.7 will replace the current 5.3 L84 and adopt an updated Dynamic Fuel Management system that can deactivate cylinders to save fuel. Its displacement nods to the celebrated LS1 and LS6 that once powered the Corvette and Camaro. The second engine, a 6.6-liter, will take over from the 6.2 LT2 with a clear performance bent. It is expected to become the centerpiece of the forthcoming Corvette Grand Sport—an application where the extra displacement should feel right at home.
GM has already committed $854 million to upgrade U.S. plants for production, though official specifications remain under wraps. Rumors point to outputs above 520 horsepower and more than 700 Nm of torque. If those figures hold, the numbers would promise serious pace while preserving the Small Block’s hallmark everyday usability.
