16pcs Rubber Positive Valve Stem Seal - Fits an 11/32" Valve Stem and a .530" Guide O.D., Valve Seals For SBC BBC SBF, Positive Seal

The Street Sport Industries 16pcs Rubber Positive Valve Stem Seal is precision-engineered for builders seeking durability and performance in small- and big-block engines. Designed to fit 11/32" valve stems and a .530" guide O.D. (.298" stem and .521" guide range), these valve stem seals ensure a secure, leak-free fit, making them ideal for both standard replacements and performance rebuilds that require tight tolerances. Built with a positive seal style, each rubber seal ring and band design provides effective oil control by preventing oil from entering the combustion chamber, resulting in cleaner combustion, reduced emissions, and improved engine efficiency. Crafted from high-grade synthetic rubber, these seals resist oil, heat, and pressure under extreme conditions, delivering long-lasting reliability for street, performance, and racing applications. For easy installation, this kit offers direct OEM crossover compatibility with SBI #322-1011, Manley #24045-1, Qualcast #38-532-55, PEP #343530/343530-P, and Pioneer #OS-2020/OS2020, meeting or exceeding factory specifications. Designed with broad application coverage, these valve stem seals fit SBC, BBC, and SBF engine setups—whether restoring a classic street machine, rebuilding a daily driver, or fine-tuning a high-performance engine. With their robust materials and proven positive seal design, Street Sport Industries valve stem seals deliver sealing power and performance you can trust in the most demanding environments.

• 🔵ENGINEERED FIT FOR 11/32” VALVE STEMS AND 0.530” GUIDE O.D.: Designed with precision dimensions including a .298" stem and .521" guide, these valve stem seals provide excellent compatibility for SBC and other engine types. 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 SBI# 322-1011, Manley# 24045-1, Qualcast# 38-532-55, PEP# 343530, 343530-P, and Pioneer# OS-2020, OS2020, 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 SBC engines and various small-block rebuilds.
• 🔵VEHICLE-SPECIFIC FIT: Expertly crafted for precision, this valve stem seal kit fits SBC, BBC, and SBF setups, offering broad application coverage for engine builders. Whether restoring classic street machines or fine-tuning high-performance builds, these seals deliver reliability you can count on.
• 🔵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 reliable SBC, BBC, & SBF valve stem seals that won’t break down.