58-78 Big Block Chrys. Oil Pump

The MELLING 58-78 Big Block Chrysler Oil Pump (M-63HV) is a high-volume internal wet-sump pump engineered for Mopar B and RB-series big-block engines. This pump delivers increased oil flow to critical engine components during sustained operation, making it an essential upgrade for street engines, performance builds, and classic Chrysler restorations requiring dependable lubrication under demand.

The high-volume design significantly increases oil circulation compared to standard equipment, reducing oil starvation risk during aggressive acceleration, cornering, and extended throttle operation. Standard pressure regulation maintains proper PSI at idle and load, protecting bearings and journals while preventing bypass relief wear. The internal configuration fits within factory mounting locations on Mopar B-block (360, 383, 400 cubic inch) and RB-block (413, 440 cubic inch) platforms without chassis modification. Melling's engineering ensures compatibility with existing crankshaft and block dimensions on these proven big-block architectures.

This pump serves restorationists rebuilding original Mopar powerplants, hot-rodders upgrading cooling and lubrication systems for street or strip use, and engine builders targeting reliable long-term performance in high-displacement applications. Buyers choosing high-volume oil pumps typically operate vehicles with modified cam profiles, roller lifters, tight bearing clearances, or extended driving sessions where stock pump output becomes insufficient. The M-63HV addresses these needs while maintaining factory reliability and pressure thresholds.