Continuing the GM tradition started in 1955, the new EcoTec3 small-block family of engines features three technologies: Variable Valve Timing (VVT), Active Fuel Management (AFM), and Direct Injection (DI)—working in conjunction in one engine to optimize fuel economy, horsepower, and torque. No other fullsize pickup engine includes all three of these technologies.
When the Electronic Control Unit (ECU) receives input that the conditions are correct, the ECU can temporarily deactivate four cylinders on the 5.3L and 6.2L V-8 engines allowing them to run in V-4 mode, reducing fuel consumption and providing the Sierra owner with class-leading V8 MPG (up to 23 MPG with the 5.3L). Even with the focus on achieving unparalled fuel economy, the GMC engineers were able to increase horsepower and torque over the previous generation V-8 engines.
Power for the new 4.3L V-6 is now an SAE-certified 285 hp and torque has been exponentially increased to a class-leading 305 lb-ft. Stepping up to the new EcoTec3 5.3L V-8, power ratings are 355 hp and 383 lb-ft. This combination allows the 2WD Double Cab with Max Trailering Package to tow an incredible 11,500 pounds (with 6’6” box and proper equipment). Available as an option on Double Cab and Crew Cab SLT trucks and Denali the new EcoTec3 6.2L V-8 pumps out an impressive 420 hp and 460 lb-ft of torque.