Uni-Directional Screen

The Uni-Directional Screen from MOROSO is a precision-engineered windage tray screen designed for engine builders and performance enthusiasts who demand superior crankcase ventilation control. This steel screen insert manages oil mist and splash-back within the crankcase, protecting internal components while reducing windage losses that rob horsepower. Whether you're building a street engine, racing platform, or high-performance rebuild, this screen delivers the directional flow control that modern performance demands.

Constructed from durable steel, the uni-directional design allows controlled airflow in one direction while blocking reverse flow and turbulent recirculation. The screen's 17.55-inch width and 32.25-inch height fit standard engine bays, and the cut-to-fit approach means it adapts to your specific windage tray configuration without permanent modification. At just 4.23 pounds, it adds negligible weight while its engineered screen geometry reduces oil carryover into the intake tract and minimizes parasitic drag on rotating assemblies—both critical factors in extracting maximum efficiency from your engine.

This windage tray screen benefits engine builders tackling displacement increases, forced induction conversions, or high-RPM applications where stock crankcase ventilation falls short. Installation is straightforward: the screen positions inside your existing windage tray, requiring no welding or permanent alterations. Its universal compatibility makes it an essential upgrade for LS platforms, big-blocks, small-blocks, and other popular engine families where controlling oil mist directly impacts power output and engine longevity.