COMP Cams Valve Seals 5/16" PTFE Umbrella O-Ring Viton Stem Seals

COMP Cams 5/16" PTFE Umbrella O-Ring Viton Valve Stem Seals Premium valve seals engineered by COMP Cams for reliable sealing, long life and superior oil control. These 5/16" (8mm) stem seals combine a low-friction PTFE umbrella with a durable Viton O-ring for maximum performance in street and race engines. Material: PTFE umbrella top for reduced friction and wear Elastomer: Viton O-ring for chemical and heat resistance Fit: 5/16" (8mm) valve stems; commonly compatible with .530" and 11/32" guide sizes Design: Umbrella-style seal provides positive oil control and helps prevent valve guide leakage Applications: Ideal for high-performance, boosted or high-temperature engines where durability and sealing are critical Upgrade to COMP Cams valve seals for improved engine reliability, reduced oil consumption and smoother valve operation. Exact fitment depends on valve guide dimensions—verify size (5/16" stem / .530" seat) before ordering.