The L8T is a new gasoline engine for use in Heavy Duty pickups. It displaces 6.6 liters in a V8 configuration via an OverHead Valve (OHV) layout otherwise referred to as push-rod. GM tells us that the motor is based on GM’s fifth-generation Small Block engine architecture initially introduced by the 6.2L V-8 LT1.
In the 2020 Silverado HD and 2020 Sierra HD, the new L8T GM engine makes an SAE-certified 401 horsepower and 464 pound-feet of torque, with strong performance at low rpm, where it is needed when pulling away with a loaded cargo box or trailer.
The 6.6L V-8 L8T gasoline engine serves as the base motor in the trucks, while the 6.6L V-8 Duramax L5P turbo-diesel serves as the optional up-level engine. The L5P makes an SAE-certified 445 horsepower and 910 pound-feet of torque.
So going forward, we can refer to the new 6.6L gasser as the L8T. Simplicity for the win!
Stay tuned to GM Authority for more information on the L8T GM engine, as well as for more GM news coverage.