6.6L LBZ Duramax Engine Specs, History, & Information
The Duramax LBZ was ultimately phased out mid-model year in 2007 due to its inability to meet strict Federal emissions regulations. Its replacement, the LMM, featured an advanced exhaust aftertreatment system that included a soot-capturing diesel particulate filter. The LBZ became a popular choice for performance enthusiasts due to the engine's strengthened design, an abundance of aftermarket support, and its reasonably high factory performance.
6.6L LBZ Duramax Specs
| Engine Family | 6.6L Duramax diesel (Duramax 6600) | |
| RPO Code | LBZ | |
| VIN Code | D (8th digit of VIN) | |
| Assembly Site | DMAX engine plant, Moraine, Ohio | |
| Applications/Production Years | 2006 - 2007 Chevrolet Silverado 2500 HD, 3500 HD 2006 - 2007 GMC Sierra 2500 HD, 3500 HD 2006 - 2007 Chevrolet Express 2500, 3500 2006 - 2007 GMC Savana 2500, 3500 2006 - 2007 Chevrolet Kodiak 2006 - 2007 GMC TopKick |
|
| Displacement | 6.599 liters (6.6 liters nominal), 402.62 CID (403 CID nominal) | |
| Configuration | 90 degree V-8 | |
| B10 Life | Not specified | |
| B50 Life | Not specified | |
| Bore | 4.055 inches (103.00 mm) | |
| Stroke | 3.897 inches (99.00 mm) | |
| Bore/Stroke Ratio | 1.04 (marginally oversquare) | |
| Compression Ratio | 16.8 : 1 | |
| Firing Order | 1-2-7-8-4-5-6-3 | |
| Cylinder Numbers |  Cylinders 1, 3, 5, and 7 are located on the passenger side bank Cylinders 2, 4, 6, and 8 are located on the driver side bank |
|
| Engine Block Material | Cast gray iron, induction hardened, deep skirt engine block | |
| Cylinder Head Material | Cast aluminum alloy | |
| Injection System | Direct injection Bosch high pressure common rail system Piezoelectric fuel injectors (7 hole) Bosch CP3 (CP3.3) injection pump 26,000 psi max injection pressure |
|
| Aspiration | Turbocharged, air-to-air intercooler Water-cooled Garrett GT3788VA variable vane turbocharger (VVT) |
|
| Minimum Cylinder Pressure | 300 psi (minimum compression test pressure) | |
| Reciprocating Assembly | Fracture split forged alloy steel connecting rods Nitrided forged steel crankshaft Forged steel camshaft Cast iron main bearing caps |
|
| Valvetrain | Overhead valve (OHV), standard cam-in-block, mechanical roller lifters 4 valves per cylinder (32 valve) |
|
| Cold Start Aid(s) | Traditional glow plug system, 1 per cylinder | |
| Engine Oil Capacity | 10 quarts with oil filter change | |
| Engine Oil Spec | See viscosity chart at 6.6L Duramax LBZ service guide | |
| Lube Oil Filter P/N | ACDelco PF2232 | |
| Fuel [1] | #2 low sulfur diesel fuel preferred (includes winterized blends) #1 low sulfur diesel fuel acceptable in cold weather Max B5 biodiesel blends (5% biodiesel, 95% petroleum diesel) |
|
| Horsepower | Sierra/Silverado | 360 hp @ 3,200 rpm |
| Express/Savana | 250 hp @ 2,500 rpm | |
| Kodiak/TopKick | 310 hp @ 3,000 rpm | |
| Torque | Sierra/Silverado | 650 lb-ft @ 1,600 rpm |
| Express/Savana | 460 lb-ft @ 1,600 rpm | |
| Kodiak/TopKick | 605 lb-ft @ 1,600 rpm | |
| Idle Speed | ~ 680 rpm @ operating temperature | |
| Governed Speed | 3,400 - 3,450 rpm (electronically governed) | |
| Emissions Equipment | Diesel oxidation catalyst (DOC), exhaust gas recirculation (EGR) | |
| Coupled Transmissions | Sierra/Silverado |
Allison 1000 6 speed automatic ZF S6-650 6 speed manual (2006 model year only) |
| Express/Savana | GM 4L85E 4 speed automatic | |
| Engine Weight | Approx. 835 lbs | |
| Engine Dimensions | Length | Approx 30.0 inches |
| Width | Approx 30.0 inches | |
| Height | Approx 32.0 inches | |
[1] - Ultra low sulfur diesel (ULSD) supersedes low sulfur diesel (LSD) specification in the United States, original OE recommendations listed.
6.6L LBZ Duramax Horsepower & Torque Curves
360 hp @ 3,200 rpm | 650 lb-ft @ 1,600 rpm