Windage Tray/Gasket Mopar BB 4.150 Stroke

The Mr. Gasket Windage Tray/Gasket for Mopar BB 4.150 Stroke (Part Number 61101G) is a solid-construction windage tray designed for big-block Mopar engines with the B and RB-series architecture. This component manages oil flow and crankcase ventilation by directing splash oil away from rotating crankshaft surfaces, reducing aerodynamic drag and parasitic losses that would otherwise rob horsepower from the engine.

A windage tray operates by creating a sealed chamber between the crank and pan, forcing oil to drain rather than churn through the crankshaft rotation. This design is especially critical in high-RPM applications where oil misting significantly increases drag. The 4.150-inch stroke specification indicates this tray is engineered for the longer-stroke big-block geometry found in displacement-focused Mopar builds. Mr. Gasket's solid gasket construction ensures a reliable seal without relying on flange distortion, maintaining consistent performance across thermal cycles common to street and competition engines.

This windage tray is targeted at Mopar big-block engine builders and restorers who prioritize efficient oiling architecture and measurable power gains. It suits applications ranging from street-driven muscle cars to drag racing and road-course setups where reducing internal friction translates directly to improved acceleration and fuel economy. The component weighs 1.6 pounds and fits within standard pan configurations for B and RB-series blocks.

Mopar enthusiasts recognize windage trays as fundamental to unlocking the full potential of big-block platforms. Combined with a quality oil pump and properly sized pan, this tray ensures consistent oil delivery to bearing surfaces while minimizing parasitic losses—a proven upgrade in both stock and modified big-block configurations.