The Street Sport Industries Top Hat Valve Stem Seal Set (16 Pack) offers a professional-grade replacement for GM LS-series engines, including LS1, LS2, LS3, LS4, LS6, and all compatible 4.8L–7.0L variants. Each seal is built from Supreme material for outstanding resistance to oil, heat, and chemicals—ensuring long-lasting protection in both performance and daily-use engines. This metal-clad, Top Hat style seal fits an 8MM (.313") valve stem and a .500" guide O.D., matching OEM part number 12482063. Designed for LS engines with single valve springs, it maintains consistent lubrication, prevents oil leaks, and minimizes valve guide wear. With precision-engineered fitment and OEM-level durability, these valve seals provide superior sealing performance for intake and exhaust applications. Each kit includes 16 seals—a full set for complete engine rebuilds or replacements. Whether you're upgrading a performance engine or maintaining OEM reliability, Street Sport Industries valve seals deliver the quality and endurance professionals trust.