PONTIAC, Mich., March 10 /PRNewswire/ --
New 6.6L Duramax turbo diesel rated at 397 hp (296 kW) and 765 lb.-ft. of torque (1,037 Nm)Segment-best diesel power complemented by up to 11-percent improved fuel economy and up to 63-percent reduced NOx emissionsSmall-block 6.0L gas V-8 enhanced for greate