What is the main benefit of PTFE valve seals?

PTFE valve seals, like these from COMP Cams, offer good sealing performance to prevent oil from entering the combustion chamber. They are also designed to provide extra clearance for dual valve springs, which is important in many performance engine builds.

What does the .630" seal diameter refer to?

The .630 inch measurement is the outer diameter of the valve seal itself. This dimension needs to match the valve guide bore in your cylinder head for a proper fit. This set is designed for valve guides that are .530 inches in outer diameter.

Do these seals come with any hardware?

This product includes a set of 16 valve seals. Installation hardware, such as valve keepers or seals for the valve stem itself, are typically sold separately or may be reused from your original components if they are in good condition.

COMP Cams Valve Seals PTFE 505-16 - Multi-Fit

Name: COMP Cams Valve Seals 3/8in PTFE
Brand: COMP Cams
Price: 35.51 USD
Availability: InStock

COMP Cams Valve Seals 3/8in PTFE

$35.51

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COMP Cams PTFE valve seals for 3/8" valve stems and .530" guides. Keep oil out of the combustion chamber.

Key Features

Fits engines with 0.530" OD valve guides and 3/8" valve stems.
Set of 16 PTFE valve seals.
Positive Stop design offers more clearance for dual valve springs.
Smaller diameter than umbrella seals for better spring clearance.
Seals keep unwanted oil from entering the combustion chamber.
Seal outer diameter is .630 inches.

⚠️ CA WARNING: This product can expose you to chemicals known to the State of California to cause cancer and/or birth defects or other reproductive harm. Learn more

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Will this fit your vehicle?

Product Details

COMP Cams is well-known for performance valvetrain components, and these Positive Stop PTFE valve seals are a solid option for keeping oil out of your combustion chamber. They work by sealing the clearance between the valve stem and the valve guide, preventing unwanted oil from entering the cylinder. This set of 16 seals is designed for applications with 3/8 inch valve stems and .530 inch valve guides.

These seals are made with PTFE, a material that offers good sealing performance. Unlike some other types of seals, these COMP Cams seals have a smaller diameter and a positive stop design, which gives you more clearance for dual valve springs. This makes them a good choice when you're working with performance cylinder heads that use multiple springs. The .630 inch outer diameter ensures a snug fit in the valve guide.

This set fits a wide range of vehicles, including many Chevrolet C/K series trucks from the 80s and 90s, as well as Chrysler and Dodge vehicles from the early 80s. They are a direct replacement for your existing valve stem seals, provided your engine has the correct valve stem and guide dimensions.