2007.5-2010 LMM Duramax

Engine Name: 6.6L Duramax (RPO Code “LMM”)

Production Plant: DMax Ltd., Moraine, Ohio

Configuration: 90-degree V-8

Bore: 4.06-inch

Stroke: 3.90-inch

Displacement: 403 ci (6.6L)

Compression Ratio: 16.8:1

Block: Deep-skirt, cast-iron (gray iron), parent bore with induction-hardened cylinder bores

Heads: Cast-aluminum with six head bolts per cylinder (with sharing), 4 valves per cylinder, forged-steel rocker arms (each rocker arm utilizes a guideless bridge to operate two valves)

Crankshaft: Forged 4340, Tufftride-treated for improved fatigue strength, and heat-treated for a cast-hardened surface

Connecting Rods: Forged-steel, cracked cap, I-beam

Pistons: Cast-aluminum with ion plated upper compression ring (for maximum durability)

Valvetrain: Overhead valve (OHV), 4 valves per cylinder, single cam-in-block design

Injection System: Electronic high-pressure common rail, direct injection

Injection Pump: Bosch CP3 radial piston high-pressure fuel pump with 3 internal plungers, gear-driven but not timed to the crankshaft or camshaft, 26,000 psi peak pressure

Injectors: Bosch electronic, solenoid type (outside valve covers) with 6-hole, 159-degree spray angle nozzles

Firing Order: 1-2-7-8-4-5-6-3

Aspiration: Turbocharged and intercooled

Intake: Cast-aluminum Y-bridge, intake airflow valve (i.e. throttle valve)

Turbo: Garrett GT3788VA VVT variable geometry, non-wastegated, journal bearing unit

Intercooler: Air to air

Emissions Equipment: Exhaust gas recirculation (EGR), diesel oxidation catalyst (DOC), diesel particulate filter (DPF)

Overall Weight: 835 lbs (dry)

Horsepower: 365 hp at 3,100 rpm

Torque: 660 lb-ft at 1,800 rpm

Available Transmissions: Allison 1000 six-speed automatic