2024 Chevy Duramax Specs Horsepower. 2020+ gm t1 platform powertrain. The 6.6l duramax l5p is the most recent generation of the duramax 6600 engine family and is found in 2017 to current chevrolet silverado, gmc sierra.

It now generates 470 horsepower (+25) and 975. The 2024 sierra 1500 ranges in power from the at4 with 305 horsepower to the denali ultimate with 420 horsepower.