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Pioneer Valve Seals

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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.

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Valve Stem Seals, Viton®, Positive Stop, .530 in. Guide, 11/32 in. Valve Stem, Set of 100

Part Number: PIO-OS-938-100

Not Yet Reviewed

Estimated Ship Date: Oct 9, 2025 if ordered today

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Estimated Ship Date: Oct 9, 2025 if ordered today

Valve Stem Seals, PTFE, Positive Stop, .531 in. Guide, 3/8 in. Valve Stem, Set of 100

Part Number: PIO-OS-1067-100

Not Yet Reviewed

Estimated Ship Date: Oct 9, 2025 if ordered today

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Estimated Ship Date: Oct 9, 2025 if ordered today

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