Cometic .162in x .288in .333in x .219in Viton Positive With Ring Valve Stem Seal

The Viton material in this Cometic valve stem seal is a key detail, offering excellent resistance to high temperatures and aggressive engine oils. This seal measures .162 inches on the inner diameter where it fits onto the valve stem, .288 inches on the outer diameter of the spring side, and features a .333 inch outer diameter on the valve guide side with a .219 inch height. These dimensions are critical for ensuring a proper seal against the valve stem and the valve guide, preventing oil from entering the combustion chamber.

Designed with a positive seal and an integrated ring, this component helps maintain consistent oil control. This is important for preventing oil consumption, reducing exhaust smoke, and ensuring your engine runs cleaner. Proper valve stem seals are a small but vital part of maintaining engine health and performance, especially when rebuilding or refreshing an engine's top end.