2024 6.6 Duramax Specs. General motors announced a revised, more powerful version of the 6.6l duramax diesel for the updated 2024 model year gmc sierra and chevrolet silverado hd. 6.6l duramax diesel timeline identifying factory horsepower and torque ratings for 2001 to current applications.

Detailed specs and features for the 2024 gmc sierra 2500hd diesel denali ultimate including dimensions, horsepower, engine, capacity, fuel economy, transmission, engine type, cylinders,. Improved styling, an upscale interior, and more powerful duramax engine make the refreshed silverado hd a compelling.