6.6L V8 Gasoline Engine (L8T): Engine Type: 6.6-liter (400 cubic inch) gasoline V8 with Direct Injection and Variable Valve Timing. Horsepower: 401 hp @ 5,200 rpm Torque: 464 lb-ft @ 4,000 rpm Transmission: This engine was typically paired with a 6-speed heavy-duty automatic transmission. Key Features: It features a cast-iron small block with aluminum heads and was designed for robust performance, offering increased towing capacity over the previous generation's gas V8.