Chevrolet's Duramax diesel lineup gets a new range topper. The automaker has just leaked the power figures for the new L5P turbodiesel which will see duty in the Chevrolet Silverado HD and its twin, the GMC Sierra HD. The new engine coincides with the recently revamped heavy-duty pickup lineup from General Motors.

GM later pulled down the leak from the site but not before Truck Trend was able to take a screenshot. When compared to the outgoing Duramax V8, the L5P gets a significant horsepower and torque bump. The previous Duramax diesel, called the LML, had an output of 360 PS and 1,037 Nm of torque from its 6.6 liter engine. It utilizes OHV valves and direct injection. Like the new engine, it was used for GM's line of heavy duty pickup trucks.

The L5P engine retains its size at 6.6 liters, as well as overhead valves and direct injection. Significant tweaks were made to the motor and it now produces 445 PS and 1,234 Nm of torque. Against other heavy-duty pickups from Ford and Ram, the Chevrolet Silverado HD now has a 5 horsepower advantage over the Forf and a 95 horsepower advantage over the Ram. As for torque, Chevrolet slots in between the Ram and Ford by with the Ram putting out 1,220 Nm and the Ford at 1,254 Nm.

The new Duramax V8 engine will be an option for the Chevrolet Silverado HD and GMC Sierra HD for the 2017 model year. These will be available in the Silverado 2500HD and 3500HD and the Sierra 2500HD and 3500HD.