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The Cometic hat-style valve stem seal for 2003–2008 Ford Powerstroke 6.0L engines is a Viton metal-jacket seal sized for direct replacement in compatible heads. Intended for contemporary engine rebuilds, it limits oil migration at the valve stem under high temperatures. The listed dimensions (.256 x .500 x 1.020 x 1.000) describe its hat-profile construction for reliable sealing in service.
Cometic 03-08 Ford Powerstroke 6.0L Hat Valve Stem Seal
