The 18mm Cylinder Head is a direct replacement part for 6.0L Powerstroke Diesel engines in Ford F-250, F-350, F-450, and F-550 Super Duty trucks from 2003 to 2007. Made of durable cast iron material, this OE spec cylinder head comes sealed and includes all necessary components. It is covered by a 3-month manufacturer warranty and features an anodized finish for added protection. With a positioning hole diameter of 20mm, this high-quality cylinder head assembly is an essential part for maintaining the performance and longevity of your vehicle's engine.