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5/16 & 8mm X .500"-.535", Positive Valve Seals, Poly Acrylic, Flex Body, 4 Cyl, VSS-417

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Product Description

Positive Valve Seals, Poly Acrylic 

Valve Seals, Flex Body, Universal Fit

Size- 5/16" or 8mm

Guide Diameter Range- .500"-.535"

4 Cylinder set, eight seals



Alex’s Parts valve seal selection is quite extensive, we offer more fitment details, material choices and seal types than anyone else on the net.

If you’re looking for quality valve seals, you’ve come to the right place!

Since we carry seals from major OEM suppliers, our Private Label valve seal quality is second to none.

Savvy builders know to purchase their seals from a knowledgeable source, we use what we sell.

These are from our FLEX BODY SEAL family


     Specification Data:

  • Size: 5/16” X .500"-.535"
  • Fits: 5/16” Valve Stems.
  • Fits: .500"-.535” Guide Boss Diameter.
  • Wall Thickness per side: .096" 
  • Total Wall Thickness: .192"
  • O.D. See Note below*
  • Seal Material: Poly Acrylic 
  • Material Temp Rating: 350F
  • Seal Type: Flex Body
  • Number of seals included in purchase: Eight
  • Valve seal protector sleeve included? No- Purchase separately.


* Based on the fact that flex seals fit a range of different guide diameters, the actual seal O.D. cannot be predetermined without knowing the existing guide diameter first but once known, it can be easily determined using simple math.

To figure the seals outside diameter after installation, use the total wall thickness specification from the chart above and add it to your applications guide diameter.

Let’s say your applications guide diameter is .502” and the total wall thickness is .192”

Guide diameter + total wall thickness = estimated seal outside diameter.

Example- .502” + .192” = .694” estimated outside diameter.

The formula won't be 100% accurate but will be close enough to make an educated selection.


     Applications for this seal size:

  • Universal fit, flex over a range of size
  • Any 5/16" valve application w/ a guide diameter between- .500"-.535"


Need a different seal? Check our other categories and if you can’t find what you’re looking for, send us a message.

All our seals are available in bulk packs of 200 or more. Write for details.


Alex’s Parts, the smart choice in valve train products~

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