This product listing contains the following part(s) that fits GM Duramax L5P 6.6L 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. If you do not know which engine you have, please give us a call before ordering! This product listing is for the following application(s): Duramax 6.6L – 2017-2024 – L5P VIN Code ‘Y' DK Engine Parts offers a variety of engine parts and kits for most Duramax applications and engine models. Please take a look at what we offer on our website and feel free to call us anytime with questions regarding items listed on our website. Also note that we offer more parts then what is currently listed on our website. If you do not see what you are looking for, please do not hesitate to call us. We have knowledgeable salesmen on standby to assist you with any questions you might have.