Oil Pan BBC Marine 7.75in Deep Box

The Oil Pan BBC Marine 7.75in Deep Box by MOROSO is purpose-built for big-block Chevrolet marine engines requiring superior oil capacity and cooling efficiency. This deep-sump design addresses a critical challenge in marine powerplants: maintaining adequate oil volume under sustained operation and dynamic hull motion. Unlike shallow street pans, the 7.75-inch depth accommodates the oil slosh and thermal expansion demands of marine duty, where prolonged idle and wide RPM swings can starve shallow reservoirs. Whether you're upgrading a performance marine engine or restoring a classic inboard, this pan ensures consistent pressure delivery and extended drain intervals in saltwater and freshwater environments.

MOROSO engineered this BBC marine oil pan with robust steel construction and a deep box geometry that maximizes sump volume while maintaining structural rigidity under hull flexing and engine vibration. The 7.75-inch depth provides approximately 4–6 additional quarts of capacity compared to standard shallow pans, reducing oil temperature rise during high-load cruise and idle scenarios where cooling is compromised. Internal baffles manage oil surge during acceleration, braking, and cornering, preventing windage losses and ensuring the pickup tube stays submerged under all operating angles. The pan's design accommodates the full-flow filtration requirements of modern marine engines and integrates seamlessly with OEM and aftermarket pickup systems on big-block Chevrolet platforms.

This pan is ideal for marine mechanics, boat builders, and engine builders serving the inboard powerboat market, particularly those working on BBC 427, 454, and 502 cubic-inch engines. The 18 x 9.5 x 26-inch footprint is engineered to fit standard big-block marine engine mounts without requiring custom fabrication or interference with through-hull hardware. Installation requires coordinating with existing pan gaskets, drain plugs, and pickup tube geometry—verify clearance to steering linkage and bilge structure before ordering. Weighing 18.63 lbs, the pan's mass distribution aids engine bay balance and vibration damping on retrofit applications.