6.6 L Duramax LB7

The LB7 Duramax was first introduced in 2001 and produced until 2004. The 32 valve, V8 design utilizes a high pressure common rail direct injection system. Due to the lack of emission equipment, the LB7 is considered one of the most sought after Duramax's built, obtaining the best fuel mileage and having the simplest design.

 

6.6 L LB7 Specifications:

 

Configuration:	V8
Displacement:	403 cubic inches, 6.6 liters
Compression Ratio:	17.5:1
Bore:	4.06 inches
Stroke:	3.90 inches
Aspiration:	Turbocharged & intercooled
Valvetrain:	OHV, 4 valves per cylinder
Oil Capacity:	10 quarts w/filter
Weight:	approx. 835 lbs
*Horsepower:	300 hp @ 3,100 RPM
*Torque:	520 lb-ft @ 1,800 RPM

*output varies slightly with model year.

 

6.6 L LB7 Information:

• LB7 applications include the Chevrolet Silverado HD, GMC Sierra HD, Chevrolet Kodiak, GMC Topkick.
• LB7 injectors suffered from a poor design and often failed. Injectors from the LB7 Duramax were eventually recalled & replaced.
• The LB7 Duramax was featured in Ward's 10 Best Engines for 2001 & 2002.
• Rumored be the most fuel efficient Duramax due to its lack of emissions equipment, which notoriously dampens fuel economy.