The Street Sport Industries 16pcs Rubber Positive Valve Stem Seal is built for precision fit and long-lasting performance in small- and big-block engines. Designed to fit 11/32" valve stems and a .562" guide O.D. (.298" stem and .551" guide range), these valve stem seals provide a secure, exact fit for both standard replacements and high-performance rebuilds that require durability and tight tolerances. Featuring a positive seal style, the rubber seal ring and band design deliver effective oil control by preventing oil from leaking into the combustion chamber, resulting in cleaner combustion, reduced emissions, and improved engine efficiency. Manufactured from high-grade synthetic rubber, these seals withstand oil, heat, and combustion pressure in demanding environments, making them ideal for street, performance, and racing engines. For hassle-free installation, this kit offers direct OEM crossover compatibility with PEP #BVV895-A0, Qualcast #38-806-55, PEP #BVV895-VI, SBI #122-1221/1221221, and SBI #122-1387/1221387, ensuring factory-quality fitment. With broad application coverage, these valve stem seals are designed for SBC, BBC, BBF, and SBF engine setups, including AMC 1960 engines, Ford 1963–1968, and Mercury 1963–1968. They are also compatible with select Case, Chrysler Marine, Cummins, Detroit Diesel, IHC Tractor, Komatsu, Mercury Marine, Nissan Industrial, and OMC Marine engines. Combining robust materials, precision engineering, and a proven positive seal design, Street Sport Industries valve stem seals provide reliable sealing power that won't break down under pressure—making them a trusted choice for builders and engine enthusiasts alike.