top of page



General Motors' highly anticipated reveal of the next generation Duramax diesel was momentarily interrupted by inadvertently publishing details of the engine's 2017 model year horsepower and torque figures via GM's Powertrain division website. Full details of the Duramax L5P shortly followed, outlining the various improvements and upgrades that help it produce 445 horsepower and 910 lb-ft of torque in addition to handling the rigorous conditions experienced under such loads. Although the L5P measures in at 6.6 liters of displacement (utilizing the same cylinder bore and stroke as previous generations), it's not far off from being characteristically classified as a clean slate design. The Duramax L5P replaced the outgoing LML for the 2017 model year Chevrolet Silverado and GMC Sierra HD pickups.

The time leading up to the introduction of the L5P had been chalked full or rumors and speculation regarding the new Duramax, which some insisted would require clean slate revisions and an increase in displacement to reach the segment's leaders. The rumors were put to rest when the 6.6L Duramax L5P was officially released, producing 48 horsepower and 145 lb-ft of torque more than the outgoing LML. A notable revision of the fuel system resulted in the advent of electronically actuated solenoid injectors instead of the piezo electric injectors the Duramax engine platform had used since its inception in 2001.

bottom of page