The LB7 Duramax marks the introduction of the first gen Duramax in 2001, a 6.6L V8 turbodiesel known for its robust performance. LB7 specs include 300 hp and up to 520 lb-ft of torque, delivering strong towing capability in Chevy and GMC HD trucks. Regarded as one of the best Duramax engine variants for its simpler design and solid foundation, the LB7 Duramax offers excellent reliability with proper maintenance and injector care.