Manley Performance Viton Material Valve Stem Seals -5/16

- A necessity when using NexTek® triple valve springs.

- Special design allows clearance inside small I.D. springs

- 5/16" / 8mm valves

- Guide O.D .420"

- Installed Seal O.D .566"

- Use Cutter no. 41510

- Quantity 8 pcs.