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Valve Stem Seals

Worn or outdated valve seals (also called valve stem seals) are one of the most common causes of excessive engine oil consumption and blue smoke on startup. When these...

Worn or outdated valve seals (also called valve stem seals) are one of the most common causes of excessive engine oil consumption and blue smoke on startup. When these small but critical components harden, crack, or lose their sealing ability, oil is pulled down the valve guides into the combustion chamber, resulting in classic symptoms of burning oil.

Modern positive valve seals made from high-temperature Viton (FKM) fluoroelastomer address this issue far better than the old umbrella-style or O-ring seals found on many classic and older engines.

Why Upgrade Older Engines to Modern Valve Stem Seals?

Older engines (small-...

Worn or outdated valve seals (also called valve stem seals) are one of the most common causes of excessive engine oil consumption and blue smoke on startup. When these small but critical components harden, crack, or lose their sealing ability, oil is pulled down the valve guides into the combustion chamber, resulting in classic symptoms of burning oil.

Modern positive valve seals made from high-temperature Viton (FKM) fluoroelastomer address this issue far better than the old umbrella-style or O-ring seals found on many classic and older engines.

Why Upgrade Older Engines to Modern Valve Stem Seals?

Older engines (small- or big-block Chevy, Ford Windsor, Mopar, etc.) often used simple umbrella seals or rubber O-rings under the keepers. These designs allowed more oil past the guides and were made from materials that harden and fail under heat.

Today’s LS-series and other late-model engines use positive valve seals—metal-jacketed or top-hat style seals that press firmly onto the valve guide. The valve stem slides through a spring-loaded Viton lip that meters just enough oil for lubrication while preventing excess oil from entering the combustion chamber.

Benefits Of Upgrading to Modern Positive Viton Valve Stem Seals:

  • Dramatically reduced oil consumption and smoking

  • Better idle quality and lower hydrocarbon emissions

  • Longer valve guide and stem life

  • Superior heat resistance (Viton handles continuous temperatures up to 400-450 degrees F)

  • Compatibility with synthetic oils and higher performance valvetrains

Many rebuilders and performance shops now machine older heads (or use drop-in designs where possible) to accept the same style of positive seals used on LS engines. The result is modern oil control on a classic or high mileage powerplant.

Premium Brands for Valve Stem Seals

  • Summit Racing recommends these trusted manufacturers for both stock replacement valve stem seals and performance Viton upgrades:

  • Summit Racing: Affordable, high-quality Viton positive seals, including LS-style hat seals and universal performance options

  • MAHLE Original: OEM-grade positive seals known for precise fit and long service life

  • COMP Cams: Extensive lineup of Viton, PTFE, and positive-stop seals designed for street, race, and dual/triple spring applications

  • Manley: Premium Viton positive seals popular in high-performance and racing builds

  • Howards Cams: Durable Viton seals engineered for performance camshaft and valvetrain upgrades

  • Fel-Pro: Reliable OEM-style and performance valve stem seals trusted by professional rebuilders

  • Enginetech: Effective, affordable seals for a wide range of domestic and import applications

Other quality options include Edelbrock, BTR, and various OEM-style kits from leading manufacturers.

Choosing the Right Valve Seals

Match the seal to your valve stem diameter (commonly 5/16", 11/32", 8 mm, etc.) and guide outer diameter. Positive seals generally provide the best oil control, while umbrella designs remain useful in certain dual-spring or clearance-limited setups. Always verify fitment for your specific cylinder heads.

Whether you’re refreshing a high-mileage daily driver or building a performance engine, upgrading to modern Viton positive valve seals is one of the most effective and cost-efficient ways to eliminate burning oil and restore proper oil control.

Get the right seals for lasting performance! Shop Summit Racing for our complete selection of valve stem seals from trusted brands like MAHLE, COMP Cams, Manley, Howards Cams, Fel-Pro, Enginetech, and more.

Individual Parts

Results 1 - 25 of 487

Valve Stem Seals, Intake and Exhaust, Chevrolet, LS, Set of 16

Part Number: BTC-VS-LSHAT-KIT

4.95 out of 5 stars ( 20 )

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Valve Stem Seals, Viton, Positive Stop, 11/32 in. Valve Stem, .530 in. Guide Diameter, Set of 16

Part Number: CCA-529-16

4.17 out of 5 stars ( 12 )

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Valve Stem Seals, Viton®, Positive Stop, 11/32 in. Valve Stem, Set of 16

Part Number: FEL-SS72861

4.54 out of 5 stars ( 26 )

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Valve Stem Seals, Intake and Exhaust, Chevrolet, LS, Set of 16

Part Number: BTC-VSLSKIT

4.8 out of 5 stars ( 5 )

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Valve Stem Seals, Intake, Premium, Chevy, 5.0/5.7L, Set

Part Number: FEL-SS72527

5.0 out of 5 stars ( 18 )

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Valve Stem Seal, Viton, Positive Stop, 11/32 in. Valve Stem, Set of 16

Part Number: HRS-93360

4.94 out of 5 stars ( 18 )

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Valve Stem Seals, Viton®, Positive Stop, .530 in. Guide, 0.344 in. Valve Stem, Set of 16

Part Number: CCA-518-16

4.68 out of 5 stars ( 37 )

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Valve Stem Seals, Viton®, Positive Stop, 0.530 in. Guide Diameter, 11/32 in. Valve Stem Diameter, Set of 16

Part Number: EDL-9725

4.73 out of 5 stars ( 15 )

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Valve Stem Seal, Viton®, Positive Stop, 0.530 in. Guide, 11/32 in. Valve Stem, Set of 16

Part Number: BRO-USVS529V-16

5.0 out of 5 stars ( 6 )

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Valve Stem Seals, Viton®, Positive Stop, .530 in. Guide, 11/32 in. Valve Stem, Set of 8

Part Number: MAN-24045-8

5.0 out of 5 stars ( 11 )

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Valve Stem Seals, Viton®, Positive Stop, .500 in. Guide, 0.342 in. Valve Stem, Set of 16

Part Number: CCA-517-16

4.45 out of 5 stars ( 22 )

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Valve Stem Seal, 8mm Diameter, Viton® Rubber, Positive Stop, Set of 16

Part Number: AFR-6612-16

4.73 out of 5 stars ( 11 )

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Valve Stem Seals, Umbrella Type, Rubber, 0.344 in. Diameter, Chevy, Set of 16

Part Number: FEL-SS10058

4.64 out of 5 stars ( 11 )

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Valve Stem Seals, Viton®, Positive Stop, .530 in. Guide, 0.372 in. Valve Stem, Set of 16

Part Number: CCA-515-16

5.0 out of 5 stars ( 11 )

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Valve Stem Seals, Viton® Fluoroelastomer, Positive Stop, 11/32 in. Valve Stem, .500 in. I.D, Set of 16

Part Number: TFS-30400454

5.0 out of 5 stars ( 5 )

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Valve Stem Seals, PTFE, Positive Stop, .530 in. Guide, 11/32 in. Valve Stem, Set of 16

Part Number: CCA-503-16

3.3 out of 5 stars ( 23 )

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Valve Stem Seals, Rubber, GM, Saab, Set of 16

Part Number: FEL-SS71039

4.37 out of 5 stars ( 19 )

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Valve Stem Seal, Replacement, 0.341 in. Valve Stem, Fits Dart/Dart Iron Eagle, 0.530 in. O.D., Each

Part Number: DRT-26000021

5.0 out of 5 stars ( 12 )

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Valve Stem Seals, Viton®, Mopar Hemi, Set of 16

Part Number: CCA-531-16

4.75 out of 5 stars ( 4 )

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Valve Stem Seals, Premium, Chevy, 5.0/5.7L, Set

Part Number: FEL-SS72526

3.94 out of 5 stars ( 17 )

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Valve Stem Seals, PTFE, Positive Stop, .530 in. Guide, 3/8 in. Valve Stem, Set of 16

Part Number: CCA-505-16

4.56 out of 5 stars ( 9 )

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Valve Stem Seals, Viton®,Blue, Positive Stop, .494 in. Guide, 11/32 in. Valve Stem, Set of 16

Part Number: CCA-506-16

5.0 out of 5 stars ( 2 )

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Valve Seals, Positive Stop, Viton Fluoroelastomer, 0.341 in. Guide, For OEM Heads, Ford, Set of 16

Part Number: TFS-2500100-VSS

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Valve Stem Seals, Viton®, Positive Stop, .500 in. Guide, 11/32 in. Valve Stem, Set of 8

Part Number: MAN-24043-8

5.0 out of 5 stars ( 2 )

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