Fits SBC, BBC, BBF & SBFVITON Positive Valve Seals - 11/32" X .500" - Set of 16 - NEW Part No:SSI-SBC11/32X500PO-VVSThis listing is for a brand new set of 16 "POSITIVE" Viton Valve Seals. They are 11/32" stem X .500" diameter. Will fit most of the aftermarket cylinder heads that use 11/32" valve stems. These are some of the best seals on the market These seals will fit . . .SBC - Small Block ChevyBBC - Big Block ChevySBF - Small Block FordBBF - Big Block FordNOTE: It is suggested you know the size of your valve guides prior to ordering so you can be assured of a proper fit These are some of the best valve seals on the market because they are made out of Viton WHY BUY VITON SEALS?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 400F, and for temperatures up to 600F 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 250F.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.We also have these for most other engines if needed, so check out our other listingsNOTE: You must check the size of your valve guide(s) prior to ordering to make sure you receive the correct fit
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