New GM 6.6L V8 L8T Gas Engine

Features best-in-class standard torque, direct injection and variable valve timing, as well as a cast iron engine block for durability.
By Dave Hagen

The General Motors 6.6L V8 L8T gasoline engine is currently available in the 2020 Chevrolet Silverado HD and the 2020 GMC Sierra. For 2021, Chevrolet added the L8T to the Low Cab Forward truck and it will offer-up more power and torque than the 6.0L V8 L96 engine which it replaces.

When equipped in the Chevrolet Low Cab Forward truck, the 6.6L V8 L8T produces 350 horsepower at 4,500 rpm and 425 pound-feet of torque at 3,800 rpm. That’s a boost of nearly 18 percent horsepower and 14 percent peak torque compared to the outgoing 6.0L L96 V8. The transmission used is the six-speed 6L90-E Hydra-Matic (RPO code MYD) with lock-up converter and overdrive.