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.

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.

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).

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.

• 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.

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.

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.