Diesel Bombers - Duramax LMM

The LMM specifications are nearly identical to the LBZ engine. It is a 6.6 L turbocharged engine and was introduced in 2006 for the 2007.5 model year. Its output has seen a slight increase of 5 hp (4 kW) and 10 lb·ft (14 N·m) of torque over the LBZ. This makes it 365 hp (272 kW) at 3200 rpm and 660 ft (201 m)·ft·lbf of torque at 1600 rpm. It's mated to an Allison 1000 6-speed transmission.
The LMM Duramax 6.6L V-8 has new equipment to help it meet the US EPA mandated 2007 emission standards. The new standard requires a 90-percent reduction in particulate matter (PM), compared with the previous standard, implemented in 2004, and a 50-percent reduction in oxides of nitrogen (NOx). The use of reformulated, ultra-low sulfur diesel fuel, which went on sale nationwide in the fall of 2006, is required to meet the new emissions standard and prevent damage to the emissions equipment.

Specifications

Engine Description: LMM
Displacement: 6.6L / 403 in³
Bore x Stroke: 4.06 in (103 mm) x 3.90 in (99 mm)
Block / Head: Cast gray iron / Cast aluminum
Aspiration: Turbocharged & Intercooled
Valvetrain: OHV 4-V
Compression: 16.8:1
Injection: Direct; Bosch High Pressure Common Rail with CP3.3 Injection Pump
Power / Torque: 365 hp (272 kW) @ 3,200 rpm / 660 lb·ft (895 N·m) @ 1,600 rpm

To meet the new emissions regulation in the US, the LMM Duramax 6.6 L V-8 engine features:

Additional combustion control, including an even more efficient variable-geometry turbocharging system, cooled (enhanced) exhaust gas recirculation (EGR) and closed crankcase ventilation to reduce nitrogen oxides (NOx)
Additional exhaust control, including oxidizing catalyst and new diesel particulate filter (DPF) to reduce soot and particulate matter
Increased-capacity cooling system
New engine control software
Use of low-ash engine oil (CJ-4)

The following trucks have or are due to have the LMM engine:

Chevrolet Silverado HD
GMC Sierra HD
Chevrolet Kodiak
GMC Topkick
Chevrolet Express/GMC Savanah