GM/Chevrolet 6.6 403 - Duramax Diesel - Production Years 2001-2004

Description

The 2001-2004 Chevrolet 403 was dubbed the LB7, and was manufactured to go into Silverado HD and Sierra HD trucks.

The LB7 is renowned for its overall reliability and simplicity, especially when compared to newer diesel motors. It featured a first-in-class common rail direct fuel injection, which frequently caused injector failures.

This fault in the engine led Chevrolet/GM to eventually issue a recall on the motors.

Built prior to increasingly stringent emissions standards for diesel engines, the LB7 remains a very popular motor. It is still the foundation for Chevy/GM’s line of Duramx Diesel engines available in new production heavy-duty trucks.

Models manufactured from 2001-2003 were able to hit roughly 235 horsepower. The 2004 models topped out at 300 horsepower.

Makes & Models

The 403 was used in 2001-2004 Chevy/GM heavy-duty trucks, including the Chevrolet Silverado and the GMC Sierra.

2004 models were capable of producing more horsepower and more torque.

• 2001-2003 Chevrolet Silverado HD
• 2001-2003 GMC Sierra HD
• 2004 Chevrolet Silverado HD
• 2004 GMC Sierra HD

2001-2004 Chevy 403ss from MABBCO

• Short Block Chevy 403 - 2001-2004
• Long Block Chevy 403s - 2001-2004

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