The Duramax LBZ is a much improved version of the LLY upon which the design is based. A stronger engine block casting, forged steel connecting rods, a higher pressure fuel-injection system ...

These days, the Duramax namesake is as linked with turbo diesel engines as peanut butter is to jelly. That wasn't always the case, though. In the late '80s and early '90s, GM's Detroit Diesel ...

The LB7 was in production until the start of 2004, when it was replaced by the LLY. The second Duramax ... control device being the EGR system. The LBZ engine stayed in production for two years ...