What is the main benefit of PTFE valve seals?

PTFE valve seals, like these from COMP Cams, offer improved sealing performance compared to traditional rubber or umbrella seals. They are also known for their durability and resistance to heat and chemicals found in engine oil.

Can these seals be used with double valve springs?

Yes, the Positive Stop design of these COMP Cams valve seals allows for more clearance, making them suitable for use with double valve springs without interference.

What specific engine dimensions do these seals fit?

These seals are designed for valve stems measuring 11/32 inches in diameter and valve guides that are 0.530 inches in outer diameter. The seal itself has an outer diameter of .630 inches.

COMP Cams Valve Seals 503-1 - PTFE

Name: COMP Cams Valve Seal 11/32in PTFE
Brand: COMP Cams
Price: 7.95 USD
Availability: InStock

COMP Cams Valve Seal 11/32in PTFE

$7.95

On Backorder

Order now to reserve yours — we'll ship as soon as stock arrives. Full refund if we're unable to fulfill.

COMP Cams PTFE valve seals for 11/32" valve stems and .530" guides. Keeps oil out of the combustion chamber.

Key Features

Fits 11/32" valve stems and .530" valve guides.
PTFE material offers improved sealing performance.
Positive Stop design allows for more clearance, suitable for double valve springs.
Outer diameter of the seal is .630".
Helps prevent unwanted oil from entering the combustion chamber.
Designed to offer better sealing than o-ring or umbrella seals.

⚠️ 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 their Positive Stop PTFE valve seals are a solid option for keeping oil out of your engine's combustion chamber. These seals fit applications with 11/32-inch valve stems and .530-inch valve guides, featuring a .630-inch outer diameter. They are designed to provide better sealing than basic o-ring or umbrella seals.

What sets these seals apart is their PTFE material and Positive Stop design, which allows for more clearance. This is particularly helpful if you're running double valve springs, as it prevents interference that can happen with smaller diameter seals. This design helps ensure consistent sealing and can be a key part of rebuilding or refreshing your engine's top end.

This particular seal, part number 503-1, is designed to fit a wide range of vehicles that meet the specific valve stem and guide dimensions. If you're working on a classic Buick, a Chevrolet truck, or a variety of other engines from the 80s and 90s, these seals are a practical choice for maintaining engine health.