How Much House Power Does A 2025 6.6 Have Power. How much horsepower and torque does the 6.6l duramax produce? — 2025 chevy silverado 2500hd ltz specs;
— the 2025 chevy with a 6.6 gas engine has a horsepower of 401 at 5200 rpm.if you need further information, feel free to ask! All 2025 silverado 2500 hd crew cab trim variations have 401 horsepower.