Speedmaster PCE354.1005 valve stem seals are constructed with a durable steel shell and Viton sealing element, delivering superior heat and chemical resistance compared to standard rubber seals. Designed specifically for 11/32" valve stems running in 0.530" guides, these seals help maintain a consistent oil film on the valve stem while minimizing unwanted oil consumption and exhaust smoke.
Engineered for performance engine builds where reliable sealing and longevity are a priority, these Viton seals hold up under elevated operating temperatures commonly found in high-performance and rebuilt engines. Always verify your valve stem diameter and guide bore dimensions against 11/32" stem / 0.530" guide specs before ordering to ensure proper fitment.
