We have been patiently waiting to find out how much power the 3.0-liter straight six diesel in the Chevy Silverado and GMC Sierra will make, and now the answer is upon us.

The new 3.0-liter Duramax in both the Chevy Silverado and GMC Sierra will produce 277 horsepower at 3750 rpm and 460 lb-ft of torque at 1500 rpm. The power will be sent through a 10-speed automatic transmission.

ALSO SEE: The 3.0L Diesel Will be Available in the GMC Sierra AT4 but Not the Chevy Silverado Trail Boss

This information was first sent to us by a reader (thanks Patrick!), who found it on the GMC build and price tool (screenshot above). We quickly reached out to a GM representative and he confirmed to TFLTruck that the power numbers shown here are the real deal.

This means that the GM 3.0-liter is the most powerful diesel in a half-ton on the market. The Ford F-150 uses a 3.0-liter diesel as well producing 250 hp and 440 lb-ft of torque, though its a V6 rather than inline cylinders.

The 2019 Ram 1500 still isn’t available with the updated EcoDiesel, though when it is made available again, it will likely produce the same 260 horsepower and 442 lb-ft of torque that was announced for the engine by the Jeep brand.

Orders for the new Duramax diesel in the Silverado and Sierra will be taken soon and GM says that the first customer deliveries will begin this summer.

Watch the Chevy Silverado with a 2.7-liter turbocharged four-cylinder pull a big load up the Ike Gauntlet below.