6.6L 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.
6.6L Duramax LB7 Specs:
Configuration: |
90 degree V8 |
Displacement: |
402 cubic inches, 6.6 liters |
Block/Head material: |
- Cast iron block |
Compression Ratio: |
17.5:1 |
Bore: |
4.06 inches |
Stroke: |
3.90 inches |
Aspiration: |
- Turbocharger |
Valvetrain: |
OHV, 4 valves per cylinder |
Injection: |
- Direct injection |
Oil Capacity: |
10 quarts w/filter |
Weight: |
approx. 835 lbs |
*Horsepower: |
235 hp @ 2,700 RPM (2001) |
*Torque: |
500 lb-ft @ 1,600 RPM (2001) |
Maximum Engine Speed: |
3,250 RPM |
*output varies slightly with model year.
6.6L LB7 Information:
• LB7 applications include the Chevrolet Silverado HD, GMC Sierra HD, Chevrolet Kodiak, GMC Topkick.
• Poorly design LB7 injectors often failed, requiring frequent replacement. Injectors from the LB7 Duramax were eventually recalled & replaced. The factory warranty was also extended to cover injectors for up to 200,000 miles.
• The LB7 Duramax was featured in Ward's 10 Best Engines for 2001 & 2002.
• Possibly the most fuel efficient Duramax due to its lack of emissions equipment, which notoriously dampens fuel economy.
• 4 bolt mains, 2 vertical, 2 horizontal.
• At 34.88 inches long, the Duramax is over an inch shorter than the 6.5L GM diesel.
• Aluminum pistons with piston cooling jets for lower combustion & piston temperatures.
• Forged & fractured connecting rods.
Related Topics:
| 6.6L Duramax LLY Specs | 6.6L Duramax LBZ Specs |
| 6.6L Duramax LMM Specs | 6.6L Duramax LML Specs |
| 6.6L Duramax LGH Specs | Compare Duramax Generations |