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3/8" Umbrella Seals, Heavy Duty Nylon w/ Viton Insert, BBC & FE Ford. Best designed 3/8" Umbrella seals available!

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Product Description

Umbrella Seals, Nylon w/ Viton Insert

3/8" Heavy Duty Full Size Umbrella Seals

Fitment: 3/8" stem BB Chevy & FE Ford.

Purchase is for 16 Seals


When it comes to 3/8" umbrella seals, these are finest design ever offered.

The seals body is made from a high temperature resistant hard nylon material with a viton grommet/insert which seals between the nylon body and valve stem. The viton insert greatly improves its ease of installation. Unlike solid nylon seals where some oil still passes between the seal and stem, the viton insert seals completely in this area.

This type of seal will not harden and break apart like other umbrella materials. The nylon body is already hard as manufactured, it will not break apart or disintegrate like rubber seals do over time. They are much more tolerant with rubbing against springs/guides than soft rubber materials.

The best feature is the seals have a very long life and frequently can be re-used even after significant mileage.

This style seal was the final design before the OEM's were forced to go with positive seals to satisfy new emissions standards.

If you're going to run umbrella seals and want the very best there is to offer, look not further.


     Specification Data:

  • Fits: 3/8" Valve Stems.
  • Inside Diameter, smallest point: .730”
  • Outside Diameter: .880”
  • Height: .810” Tall
  • Depth of ID- .670"
  • Seal Material: Nylon w/ Viton Grommet
  • Material Temp Rating: 450F
  • Seal Type: Heavy Duty Umbrella
  • Fits single spring w/ damper on BBC and FE Ford? YES!
  • Fits dual springs? Will NOT fit inside dual valve springs.
  • Part # VSS-312
  • Number of seals included in purchase:Sixteen Seals


An excellent umbrella seal for Big Block Chevy & FE Ford w/ 3/8" stem valves.


Although in limited supply, we also carry this type of seal in a small OD version for select dual springs. To review size details, enter VSS-313 into the search engine.



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