From the Blog

2012 GMC Sierra Truck Engines

True craftsmanship is timeless. That it’s in the details where you find the difference. And no matter what the task, the biggest challenges can always be conquered if you have the right plan. That’s the same attitude that’s built into every Sierra. It’s why the GMC Sierra offers you horsepower and fuel economy in the same engine—V8 fuel economy that no other competitor can beat. It’s why the 2012 GMC Sierra offers advanced technology like Active Fuel Management, maximizing your engine’s performance to give you power and efficiency as you need it.

2012 GMC Seirra 1500 mid-Michigan

To give you uncompromised power and torque for confident daily driving, passing and trailering, look no further than the Vortec engine family. Each model uses innovative “vortex technology” to swirl and tumble the incoming air and fuel for optimum power and response.

Vortec 4.3L V-6 [LU3]
Horsepower: 195 hp @ 4600 rpm
Torque: 260 lb-ft @ 2800 rpm

Vortec 4.8L v-8 vv t [L20]
Horsepower: 302 hp @ 5600 rpm
Torque: 305 lb-ft @ 4600 rpm
FlexFuel Capable

Vortec 5.3L v-8 vv t [LMG]
Horsepower: 315 hp @ 5200 rpm
Torque: 335 lb-ft @ 4000 rpm
Active Fuel Management/FlexFuel Capable

Vortec 5.3L v-8 vv t [LC9]
Horsepower: 315 hp @ 5200 rpm
Torque: 335 lb-ft @ 4000 rpm
Active Fuel Management/FlexFuel Capable

Vortec 6.2L v-8 vv t [L9H]
Horsepower: 403 hp @ 5700 rpm
Torque: 417 lb-ft @ 4300 rpm
FlexFuel Capable

For easy responsiveness in low-speed city driving and bold power for open-road passing or trailering, many Vortec engines feature VVT . It monitors and changes valve open and close points for near-peak levels of torque across the entire range of engine speeds.

For maximum fuel economy when your load is light, and maximum V-8 power when it isn’t, Sierra 5.3L and 6.0L V-8 engines use the advanced technology of Active Fuel Management. This available system senses load and demand then seamlessly activates or deactivates four of the engine’s eight cylinders (below). In the Sierra XFE model, this technology results in best-in-class V-8 EPA-estimated highway fuel economy of 22 mpg.

One of the key components of AFM is a specially designed valve lifter. Under low-load conditions, pressurization of the valve lifter’s switching mechanism deactivates the cylinder. Under high-demand conditions, the switching mechanism is depressurized, reengaging the cylinder and restoring full power as you need it, without ever noticing the transition.


VORTEC 6.0L V-8 VVT (L96)
For strong, steady power at a standstill to bold acceleration on the highway, the 6.0L V-8 is up to the task and then some. Thanks to VVT technology, this engine can dig in at low speed to move a cabin cruiser up a boat ramp without complaint. It can just as easily apply its full power for safe highway passing or offer up the muscle to conquer a steep grade.

Vortec 6.0L V-8 VVT (L96)
Horsepower: 360 hp @ 5400 rpm
Torque: 380 lb-ft @ 4200 rpm
FlexFuel Capable

To give you more choices at the pump for 2012, the 6.0L V-8 (L96) is capable of running on E85 ethanol. This advanced biofuel is a mostly renewable fuel that burns cleaner than gasoline and helps to reduce the need for imported oil.

GMC Sierra Duramax Engine SaginawFor off-the-chart horsepower and torque with off-the-map range, the choice is Duramax. With advanced diesel direct-injection technology that helps it start in as little as 3.0 seconds at -40°F and a sophisticated Allison transmission with overdrive, this available powertrain can give you a maximum highway range of up to 680 miles on a single fill-up, thanks to its extra-large 36-gallon fuel tank.

Duramax Diesel 6.6L V-8 Turbo

Horsepower: 397 hp @ 3000 rpm
Torque: 765 lb-ft @ 1600 rpm

To reduce carbon-dioxide emissions and stretch your fuel budget further, the Duramax 6.6L is engineered to operate on B20 biodiesel, a mixture of 20 percent biodiesel produced from domestic, renewable resources, and 80 percent petroleum diesel.

For fast starts in cold weather, quieter operation and maximum efficiency, the direct injection system operates at nearly 30,000 psi to turn heavy diesel fuel into a fine mist, burning clean and fast with lower emissions and greater power than the previous model.

For more information on the available 2012 GMC Sierra engines contact a Labadie GMC truck professional at (989) 667-2000 or visit