The LB7 was the first to be introduced in 2001. The V8 engine is a 6.6 L (402.8 cu in) and it has 300 hp (224 kW) and 520 lb·ft (705 N·m) of torque. It is a 32-valve design with high-pressure common-rail direct injection and aluminum cylinder heads.
The Duramax was on the Ward's 10 Best Engines list in 2001 and 2002.
The following trucks use the LB7:

• Chevrolet Kodiak/GMC Topkick
• Chevrolet Silverado/GMC Sierra HD

Specifications

• Engine Description: LB7
• Displacement: 6.6L / 403 in³
• Bore x Stroke: 4.06 in (103 mm) x 3.90 in (99 mm)
• Block / Head: Cast gray iron / Cast aluminum
• Aspiration: Turbocharged & Intercooled
• Valvetrain: OHV 4-V
• Compression: 17.5:1
• Injection: Direct; Bosch High Pressure Common-rail
• Power / Torque: 300 hp (220 kW) @ 3,100 rpm / 520 lb·ft (705 N·m) @ 1,800 rpm

 

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