Industrial Injection LB7 Duramax Stage 2 Short Block Engine (2001-2004)Industrial Injection LB7 Duramax Stage 2 Short Block Engine (2001 2004) Take your 20012004 LB7 Duramax to the next level with the Industrial Injection Stage 2 Short Block. Designed for high horsepower street trucks, drag racing, sled pulling, and competition applications, this engine package is built to handle serious power while maintaining the durability and reliability that Industrial Injection engines are known for. Every Stage 2 Short Block is