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Pioneer Valve Seals OS-938-1000

Pioneer Automotive OS-938-1000 - Pioneer Valve Seals

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Valve Stem Seals, Positive Stop Type, Viton®, 0.710 in. Seal O.D., 0.344 in. Stem Diameter, Set of 1,000

Estimated Ship Date: 3/16/2015 (if ordered today) Would you rather pick it up? Select Location

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Brand: Pioneer Automotive

Manufacturer's Part Number: OS-938-1000

Part Type: Valve Stem Seals

Product Line: Pioneer Valve Seals

Summit Racing Part Number: PIO-OS-938-1000

UPC: 727993597590

Valve Stem Diameter: 0.344 in.

Valve Stem Seal Type: Positive stop

Valve Stem Seal Material: Viton®

Machine Work Required: No

Valve Guide Diameter (in): 0.530 in.

Valve Stem Seal Outside Diameter (in): 0.710 in.

Quantity: Sold as a set of 1,000.

Notes: Requires machining the top of the valve guide with a special .530 in. diameter cutter.

In-Store Pickup: Choose In-store pick-up (OH, GA, NV) on our web site.

Pioneer offers a complete line of valve seals, from stock O-rings to positive stop PTFE or Viton® seals. These seals are a must to keep unwanted oil from entering the combustion chamber through the clearance in the valve guides. The O-ring seals use the standard retainer and oil splash shield. The umbrella seals are normally used when a larger-than-stock diameter spring is used. In the case of a double spring, the positive stop PTFE seals are used. For triple-spring applications, use the smaller-diameter Viton® seals.


Some parts are not legal for sale or use in California on any pollution-controlled motor vehicles

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