According to unconfirmed reports, General Motors may be planning to revive the shelved 4.
5-liter Duramax V-8. The baby Duramax was initially intended for the light-duty Chevrolet Silverado and GMC Sierra but this could also spread to the heavy-duty truck lineup.
Sources told PickupTrucks.com that certain GM officials want to bring to life its plans for the in-house-designed Duramax, designated LMK. One reason cited was that it is ready to be implemented. GM said that a nicely developed diesel powerplant may give an edge in fleet averages especially when considering that the standards for fuel economy and emissions are in constant scrutiny from state and federal authorities.