We just purchased the 2023 GMC Sierra with the AT4 package. This truck has the new LZ0 3.0L Duramax. This engine is rated at 305 HP and 495 lb. ft. of torque from the factory. On our Mustang chassis dyno we measured 247 horsepower and 412 lb. ft. of torque to the rear wheels stock. We look forward to share more development with you on this truck, so subscribe to our YouTube channel and be ready for more video content coming!
... See MoreSee Less