[Image by Joe Haupt via Flickr | Cropped and scaled | CC BY-SA 2.0] In mid-2004, Chevy followed up the LB7 with the LLY Duramax, which boasted a new injector design that made servicing much easier.

The powerful V8 engines did so bearing the name LB7, and yes, they were eventually replaced by Duramax builds branded LLY.