These are our brand gaskets that we have been developing for years to provide a quality product without relying on other manufacturers. We have eliminated the middleman and deal directly with the manufacturer, where we can modify, enhance, and produce the quality the end user desires. Special Notes about the Product(s): Cylinder Head Gasket Material: Multi-Layered Steel Includes Cylinder Head Dowels Cylinder Head Gasket Thickness: .059″ This product listing fits the following application(s): 391 CID (6.4L) 32V Turbo V8 Powerstroke Diesel