This is a 20-pack of valve stem seals, which are small but super important parts inside your engine's cylinder head. Their job is to seal the valve guides and prevent engine oil from leaking down into the combustion chambers (which causes blue smoke and oil consumption) while still allowing a little oil to lubricate the valve stems. These are the 'positive' type of seal and are made from Viton material. Viton is a high-quality synthetic rubber known for excellent heat resistance and durability, which is crucial in the hot environment inside an engine. This particular pack is intended for use on GM/Chevy 6.2L and 6.5L diesel engines. They're designed as direct replacements to help restore proper sealing and prevent oil leaks, which can help with engine performance and longevity. They come in a pack of 20, which is typically enough for one engine (most V8s have 16 valves, so you have spares). They're a key component during an engine rebuild or top-end refresh. As always, double-check the fitment for your specific engine model and year to ensure compatibility before starting any project.
