Cometic 7.5X14X13X16.8 Viton Valve Stem Seal - Metal Jacket

The metal jacket on this Cometic valve stem seal, measuring 7.5mm x 14mm x 13mm x 16.8mm, is a key design choice. It helps ensure the seal stays firmly seated in the cylinder head, even under the heat and pressure of engine operation. This seal is crucial for preventing oil from leaking past the valve guides and into the combustion chamber, which can cause blue smoke on startup and increased oil consumption.

Made with Viton material, known for its resistance to heat and chemicals, these seals are built to last in demanding engine environments. The metal jacket adds an extra layer of security, making sure the seal maintains its integrity and function over time. This is a popular choice for many Ford and Mercury vehicles from the 1970s through the 1990s, including models like the Ford Mustang, Ranger, and Mercury Capri.

When you're rebuilding an engine or just addressing oil consumption issues, replacing valve stem seals is a common and effective step. Having well-made seals like these from Cometic can make a noticeable difference in how your engine runs and how clean its emissions are.