16pcs Rubber Positive Valve Stem Seal – Fits an» Valve Stem and a 0.530 11/32
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. 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.