These I got off e bay, not many sellers of these, I have found.

Seller promo's:

This listing is for a set of 8 Metal Clad Viton Valve Seals. They are 8mm X .425" diameter and will fit the BMW M10 engines. These valve seals are 8mm (.315") stem X .425" diameter.

These are some of the best seals on the market, as quality materials and springs are used in our valve seals.

These seals are a direct replacement aftermarket seal made of Viton material, which is the best material that withstands the highest temperatures. This seal is a brand new production seal.



  • Viton and other seals have several very crucial differences that make them especially well suited to certain applications. While both Viton and other seals both serve as great sealing options at moderate temperatures, Viton is far superior to other seals for high temperature applications. Viton seals provide an indefinite seal for temperatures up to 400°F, and for temperatures up to 600°F they offer an excellent seal for more than 48 hours. Valve seals made of non-Viton materials, such as Poly, are only effective up to 250°F.
  • These are brand new production seals. Viton has good flexibility like Nitrile, which means it can handle some runout between the valve stem and guide. It is also considered to be a more durable material than silicone. Viton also has better wear resistance than most other seal materials, making it a good choice for applications where long term durability is a must.
  • Viton seals provide less friction as well, due to 5% Teflon.

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    Randy