2025 Duramax 6.6 Hp
2025 Duramax 6.6 Hp. Complete information, specs, power and torque ratings on gm's 6.6l l5p v8 turbo diesel duramax engine used in the chevy silverado hd and gmc sierra hd. Use this chart to identify the factory output ratings for your duramax diesel.
Other news, the 6.6 gasser gets the big 10 speed for 2025 and some new color and trim options. Denali goes ultimate, at4x joins the ranks.