GM/GMC News
The 2027 GMC Sierra HD's New 8.3L Duramax Makes 555 HP and 1,230 LB-FT
GM has released the major 2027 GMC Sierra HD specifications, including 555 horsepower, 1,230 lb-ft of torque, and configuration-dependent towing capability.
Published Sep 22, 2026
Read Article








