The 2026 GMC Sierra 1500 gives drivers in Helena multiple engine options. The 5.3-liter V8 generates 355 horsepower along with 383 pound-feet of torque. For those wanting even more, the 6.2-liter V8 creates 420 horsepower and 460 pound-feet of torque. A 2.7-liter TurboMax engine is also available, making 310 horsepower and 430 pound-feet of torque. The 3.0-liter Duramax Diesel option provides 305 horsepower with 495 pound-feet of torque for better fuel efficiency.