Ferrea 8mm (5/16in) .500in ID Hi-Temp Viton Valve Stem Seals - Set of 16

Ferrea high-temperature Viton valve stem seals sized for an 8mm (5/16in) valve stem with a .500in inside diameter, suitable for intake or exhaust use. Viton (fluoroelastomer) resists heat and controls oil consumption, making these a versatile upgrade for a rebuild or built engine. Sold as a set of 16.

Specifications

Shipping

• In-stock orders placed before 3 PM EST ship the same day — everything else ships within 24 hours.
• Standard, expedited, and overnight options at checkout.
• Oversized items ship by freight and take longer.
• Backordered items ship as soon as stock lands — contact us for lead times.
• International orders: prices do not include VAT, duties, or import fees. Your country charges these at import and they are the buyer’s responsibility.

Returns

• 30-day returns on new, uninstalled items in original packaging with all hardware.
• Standard returns: 8% restocking fee, buyer pays return shipping. Both waived if the item is defective or we made the error.
• Installed or used parts can’t be returned — confirm fitment before you install.
• Special orders and custom items are final sale.
• Email us for return authorization before shipping anything back.

Full details: Shipping Policy · Refund Policy