About Our Valley Covers

A valley cover, also known as a lifter valley plate, is a component that seals the lifter valley located between the cylinder heads in V-type engines. It plays a critical role in protecting internal engine components by preventing debris, dirt, and contaminants from entering the engine while maintaining proper oil containment and pressure. 

In modern engines such as GM LS and LT platforms, the valley cover also integrates features related to crankcase ventilation and oil control. Many designs include provisions for PCV (positive crankcase ventilation) systems, helping regulate airflow through the engine and reduce oil vapor buildup. 

Upgrading to a high-performance valley cover can provide several advantages, including improved sealing, increased durability, and better support for modified engine setups. Billet aluminum valley covers are commonly used in performance applications due to their strength, heat resistance, and ability to handle increased engine stress.

Some valley covers are designed to eliminate factory systems such as Active Fuel Management (AFM) or Displacement on Demand (DOD), making them a popular upgrade for LS and LT performance builds. Others include additional features such as oil fill provisions, sensor ports, or improved baffling for enhanced oil control.

Whether you're replacing a factory component or upgrading for performance, choosing the right valley cover helps ensure proper sealing, improved engine reliability, and a clean, professional engine bay appearance.

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