Street Sport Industries 16pcs Rubber Positive Valve Stem Seal - Fits an 11/32" Valve Stem and a .500" Guide O.D., Valve Seals For BBC Chevy Chevrolet Big Block Performance, Positive Seal

• ENGINEERED FIT FOR 11/32? VALVE STEMS AND 0.500? GUIDE O.D.: Designed with precision dimensions including a .309" stem and .480"-.520" guide, these valve stem seals provide excellent compatibility for BBC, Chevy, and Chevrolet Big Block Performance. Each valve stem seal ensures a secure fit, making it ideal for standard valve seals replacement or performance rebuilds that demand tight tolerance and durability.
• POSITIVE SEAL STYLE FOR EFFECTIVE OIL CONTROL: Featuring a positive seal design, our valve stem seals effectively prevent oil from leaking into the combustion chamber. The rubber seal ring and band style enhances oil metering and reduces unwanted emissions. These valve stem seals support cleaner combustion and improved engine performance in both stock and high-output engines.
• DIRECT OEM CROSSOVER FOR HASSLE-FREE INSTALLATION: Compatible with Qualcast # 38-810-45, Pep# 58012, 55005, OEM# E3DZ6571A, Silver Seal# 45704, and SBI# 122-1269, this valve stem seal kit serves as a reliable direct-fit replacement. The included valve seals are engineered to meet or exceed factory specs, making this valve stem seals replacement kit a solid option for BBC, Chevy, and Chevrolet Big Block engines rebuilds.
• VEHICLE-SPECIFIC FIT: This valve stem seal kit fits BBC, Chevy, and Chevrolet Big Block engines setups, offering wide application coverage for builders working on street or performance engines. Built to match Buick engines 1990-1994, Chevrolet 1992-1995, Oldsmobile 1992-1995, as well as Pontiac 1989-1995.
• HEAVY-DUTY MATERIALS RESIST OIL, HEAT, AND PRESSURE: Manufactured using high-grade synthetic rubber, these standard valve seals provide long-lasting sealing power under high-stress conditions. Each valve seal is precision-made to handle oil, heat, and compression in demanding performance or racing environments. A smart choice for anyone needing a reliable valve stem seals that won?t break down.

The Street Sport Industries 16pcs Rubber Positive Valve Stem Seal is engineered for precision fit and reliable performance in BBC Chevy Chevrolet Big Block engines. Designed to fit an 11/32" valve stem and a .500" guide O.D. (.309" stem and .480"?.520" guide range), these valve stem seals ensure a secure, leak-free fit for both standard replacements and high-performance rebuilds. Featuring a positive seal design, the rubber seal ring and band construction provide superior oil control by preventing oil from entering the combustion chamber, resulting in cleaner combustion, reduced emissions, and improved engine efficiency. Built with high-grade synthetic rubber, these seals withstand oil, heat, and pressure in even the most demanding environments, making them ideal for street or racing applications. Direct OEM crossover compatibility includes Qualcast #38-810-45, Pep #58012, 55005, OEM #E3DZ6571A, Silver Seal #45704, and SBI #122-1269, offering hassle-free installation with a factory-quality fit. This vehicle-specific kit covers a wide range of applications, including Buick (1990?1994), Chevrolet (1992?1995), Oldsmobile (1992?1995), and Pontiac (1989?1995), giving builders confidence in durability and coverage. Backed by strict quality standards, Street Sport Industries valve stem seals deliver long-lasting sealing power and performance that won?t break down under pressure, making them a trusted choice for big block performance engines.