High-quality valve stem seals are vital to an engine’s performance and longevity! The Supertech 5.5mm Viton Valve Stem Seals are heat resistant to 400°F and are extremely resistant to even the most aggressive fuels, oils, and abrasion - providing superior sealing and maximum durability.

Provides proper valve lubrication and minimizes valve guide wear while keeping oil out of the combustion chambers, resulting in improved engine efficiency and performance under all conditions, including the high rpm and extreme heat levels generated by today’s high-performance builds.    



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