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Return to Parts List Category : A- Small Block "LA" : Gaskets : Valve Stem Seals HUG 3806 VALVE STEM SEAL 5/16"X .530" GUIDE ULTRA BLEND FLUOROELASTOMER (KNOWN AS VITON) $2.00 Ultra Blend Fluoroelastomer (Known As Viton) Full, metal clad outer shell Ultra blend flouroelastomer sealing material Flouroelastomer rubber seal ID which provides worry free seal retention to the valve guide boss and also controls oil creep Low drag single lip wiper with low tension stainless garter spring to control seal lip throughout valve motion Unlike Teflon® ('PC' style seals), flouroelastomer material stays soft, flexible and offers excellent abrasion resistance This flouroelastomer material will perform well at 400°F continuously and will live with intermittent temperatures up to 550°F Available in 4 valve stem sizes Available in 6 guide boss sizes A protective valve stem sleeve for use during installation is provided with complete sets of seals Either tap in place with a deep well socket or twist on by hand with light oil on the valve guide Sold each     All valve stem seals must be installed with the protective sleeves and the proper installation tools. Failure to use the protective sleeve may result in tearing of the seal. Valve spring shims or cups should be installed before the seals are installed. Valve stem seals should never be reused. The failure rate of re-used seals is very high.