High-quality valve stem seals are vital to an engine's performance and longevity. Skunk2 Racing valve stem seals provide exceptional lubrication while keeping oil out of the combustion chamber. They provide precise oil control and maximum durability, even at high rpm. Unlike OEM valve stem seals that use different materials for intake and exhaust seals, all Skunk2 seals exceed OEM specifications, are manufactured from high-quality Viton®, and feature stiffer retaining springs. The result is an accurate fit along with a resistance to extreme heat, oil additives, and abrasion.