The LB7 was the first-generation 6.6L Duramax, used in 2001-2004 Chevrolet Silverado and GMC Sierra 2500/3500 HD trucks. It's known for a strong bottom end and for early-style fuel injectors that are a common wear item. We carry OEM-brand LB7 parts - fuel injectors, CP3 injection pumps, and related fuel-system and engine components - many with no core charge and fast US shipping. Because Duramax parts vary by generation, verify the part against your LB7 by OEM cross-reference before ordering.