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5/16" X .530" or 8mm X .530" Viton Valve Seals, Fixed Body Seals, Universal, VSS-291

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Calculated at checkout

Product Description

Fixed Body Positive Valve Seals, Premium Blue Viton

Valve Seals, Universal Fit

 5/16" X .530" and/or 8mm X .530"



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 line is second to none.

These work on either 5/16" or 8mm valve stems. (.310"-.315")


Specification Data:

  • Size: 5/16” X .530” or 8mm X .530"
  • Fits: .310"-.315" Diameter Valve Stems, 5/16" or 8mm
  • Fits: .530” Guide Boss Diameter.
  • Outside Diameter: .673" (average)
  • Seal Material: Premium Viton
  • Material Temp Rating: 450F
  • Seal Type: Fixed Body
  • Number of seals included in purchase: Sixteen
  • Valve seal protector sleeve included? YES- One 5/16" sleeve is now included.


Common Applications for this seal size:

  • Aftermarket heads w/ 5/16" Stem Valves and .530" guide boss diameter
  • Late Model Chrysler magnum engines, 318/360
  • Any 5/16" valve application w/ a .530" guide diameter


Need a different size 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~