Compatible with GM Duramax - LLY- New Cylinder Heads Complete With Valve Train (2) This product listing contains the following part(s) Compatible with the GM Duramax LLY applications: (2) Brand New Cylinder Heads with All New Valve Train Components All New Valves, Springs, Seats, Seals, Retainers, and Keepers All of our heads are brand new with complete valve train including black nitride coated valves. Limited 1-Year Warranty Special Notes about the Product(s): Please verify your engine model before purchasing. This product listing is Compatible with GM Duramax LLY in the following application(s): Compatible with GM Duramax 6.6L - 2004.5-2005 - LLY VIN Code '2' 403 CID (6.6L) 32V Turbo V8 Duramax Diesel. DK Engine Parts offers a variety of engine parts and kits Compatible with GM Diesel applications and engine models.