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) |
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RPO Code: |
LBZ |
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VIN Code: |
D (8th digit of VIN) |
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Assembly Site: |
DMAX engine plant, Moraine, Ohio |
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Applications/Production Years: |
2006 - 2007 Chevrolet Silverado 2500 HD, 3500 HD |
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Displacement: |
6.599 liters (6.6 liters nominal), 402.62 CID (403 CID nominal) |
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Configuration: |
90 degree V-8 |
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B10 Life: |
Not specified |
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B50 Life: |
Not specified |
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Bore: |
4.055 inches (103.00 mm) |
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Stroke: |
3.897 inches (99.00 mm) |
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Bore/Stroke Ratio: |
1.04 (marginally oversquare) |
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Compression Ratio: |
16.8 : 1 |
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Firing Order: |
1-2-7-8-4-5-6-3 |
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Cylinder Numbers: |
Cylinders 1, 3, 5, and 7 are located on the passenger side bank |
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Engine Block Material: |
Cast gray iron, induction hardened, deep skirt engine block |
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Cylinder Head Material: |
Cast aluminum alloy |
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Injection System: |
Direct injection |
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Aspiration: |
Turbocharged, air-to-air intercooler |
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Minimum Cylinder Pressure: |
300 psi (minimum compression test pressure) |
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Reciprocating Assembly: |
Fracture split forged alloy steel connecting rods |
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Valvetrain: |
Overhead valve (OHV), standard cam-in-block, mechanical roller lifters |
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Cold Start Aid(s): |
Traditional glow plug system, 1 per cylinder |
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Engine Oil Capacity: |
10 quarts with oil filter change |
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Engine Oil Spec: |
See viscosity chart at 6.6L Duramax LBZ service guide |
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Lube Oil Filter P/N: |
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Fuel [1]: |
#2 low sulfur diesel fuel preferred (includes winterized blends) |
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Peak Horsepower: |
Sierra/Silverado |
360 hp @ 3,200 rpm |
Express/Savana |
250 hp @ 2,500 rpm |
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Kodiak/TopKick |
310 hp @ 3,000 rpm |
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Peak Torque: |
Sierra/Silverado |
650 lb-ft @ 1,600 rpm |
Express/Savana |
460 lb-ft @ 1,600 rpm |
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Kodiak/TopKick |
605 lb-ft @ 1,600 rpm |
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Idle Speed: |
~ 680 rpm @ operating temperature |
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Governed Speed: |
3,400 - 3,450 rpm (electronically governed) |
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Emissions Equipment: |
Diesel oxidation catalyst (DOC), exhaust gas recirculation (EGR) |
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Coupled Transmissions: |
Sierra/Silverado |
Allison 1000 6 speed automatic |
Express/Savana |
GM 4L85E 4 speed automatic |
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Engine Weight: |
Approx. 835 lbs |
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Engine Dimensions: |
Length: |
Approx 30.0 inches |
Width: |
Approx 30.0 inches |
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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.