Valve Covers & Breathers

Form Meets Function

TSP valve covers and breather systems combine style with essential engine ventilation. Built from high-quality materials and designed for proper crankcase relief, each component ensures clean operation while enhancing the look and performance of your build.

From polished finishes to precision-machined fittings, every piece is crafted for a perfect seal, long-lasting durability, and a show-quality appearance that stands out under the hood.

About Our Valve Covers and Breathers

Valve covers and breathers play a critical role in both engine protection and crankcase ventilation. Valve covers seal the top of the engine, protecting internal components such as rocker arms and valvetrain assemblies while preventing oil leaks and contamination. High-quality valve covers are designed for proper sealing, durability, and clearance for performance valvetrain components.

Valve cover breathers are an essential part of the engine’s ventilation system. They allow fresh air to enter the crankcase while helping release pressure and gases created during combustion. This works in conjunction with the positive crankcase ventilation (PCV) system to maintain proper airflow and reduce internal pressure. 

Upgrading valve covers and breathers can improve both performance and reliability. Performance valve covers often provide additional internal clearance for upgraded components such as roller rockers, while breathers help ensure proper airflow and reduce the risk of oil leaks or pressure buildup.

In addition to function, valve covers and breathers are a popular engine dress-up upgrade. Available in aluminum, steel, and chrome finishes, these components help create a clean, professional engine bay appearance while maintaining proper engine ventilation and protection.

Whether you're restoring a classic engine or upgrading a performance build, choosing the right valve covers and breathers helps ensure proper sealing, improved ventilation, and long-term engine reliability.

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Valve Covers and Breathers FAQs

What is the purpose of a valve cover?

A valve cover (sometimes called a rocker cover) protects your engine’s valvetrain while sealing in oil and preventing contaminants from entering. It also provides a mounting point for breathers or PCV (Positive Crankcase Ventilation) components.

What is a breather / PCV system and why is it needed?

A breather or PCV system allows crankcase gases (blow-by) to escape from the engine rather than pressurize the crankcase. Proper ventilation helps maintain internal pressure, prevents oil leaks, and supports cleaner engine operation.

How do I choose the right valve cover and breather setup?

Match the valve cover to your engine make/model and cylinder head design. Check for bolt pattern, height (clearance), and breather port locations. For breathers, choose based on vent flow capacity and whether your system is open or closed (vent-to-atmosphere vs. routed to intake).

What materials are used in TSP valve covers?

TSP valve covers are typically made from billet aluminum or cast aluminum alloy, offering superior strength, lightweight properties, and premium finishes. They resist warping and leaking under performance use.

How do I maintain valve covers and breathers?

  • Inspect the cover gasket or O-ring periodically and replace if leaking.
  • Make sure breather filters or PCV valves are clean and free of debris.
  • Check breather hoses for cracks or blockages.
  • Ensure bolts are torqued to spec after initial heat cycles.

Will a breather system affect engine performance?

When sized and installed correctly, no. A properly designed breather system ensures optimal crankcase ventilation without affecting vacuum or introducing backpressure. Oversized or poorly routed breathers may lead to oil separation issues or intake contamination.

Do TSP valve covers and breathers come with a warranty?

Yes — all TSP valve covers and breather kits are backed by our 1-year limited warranty against manufacturing defects. Be sure to review our Warranty & Returns page for full terms and conditions.