2006-2007 LBZ Duramax
Higher injection pressure, lower compression, and best-in-class horsepower and torque made the LBZ a home run for GM.
Engine Name: 6.6L Duramax (RPO Code “LBZ”)
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, updated reluctor wheel
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 7-hole, 158-degree spray angle nozzles
Firing Order: 1-2-7-8-4-5-6-3
Aspiration: Turbocharged and intercooled
Intake: Cast-aluminum Y-bridge, enlarged turbo inlet manifold over LLY model
Turbo: Garrett GT3788VA VVT variable geometry, non-wastegated, journal bearing unit
Intercooler: Air to air
Emissions Equipment: Exhaust gas recirculation (EGR)
Overall Weight: 835 lbs (dry)
Horsepower: 360 hp at 3,200 rpm
Torque: 650 lb-ft at 1,600 rpm
Available Transmissions: Allison 1000 six-speed automatic
