Hi-Volume Oil Pump Mopar Gen III Hemi 5.7L/6.4L

The MELLING Hi-Volume Oil Pump for Mopar Gen III Hemi 5.7L/6.4L (Model M452HV) is a high-capacity internal wet sump pump engineered to maximize oil delivery in high-performance and heavy-duty Gen III Hemi applications. This pump is the direct upgrade path for builders and operators running elevated RPM ranges, extended duty cycles, or modified engine specifications where OEM pump capacity falls short of cooling and lubrication demands.

Designed as an internal wet sump unit, the M452HV maintains full compatibility with factory Hemi block architecture while delivering increased volumetric flow across the entire operating range. This is critical for engines subjected to sustained high-load scenarios—extended towing, competitive driving, or off-road recovery operations—where conventional pump output cannot sustain adequate film strength on bearing surfaces and valve train components. The high-volume designation indicates increased displacement per revolution compared to stock Hemi pumps, translating to measurable pressure maintenance under stress conditions that would starve a standard pump.

This pump addresses a specific engineering gap: factory Hemi pumps prioritize efficiency and emissions compliance over capacity reserve. Users pushing modified 5.7L or 6.4L blocks—whether through boost, displacement increase, or aggressive ignition timing—encounter oil starvation symptoms: lifter noise, timing chain rattle, or bearing wear under peak load. The MELLING M452HV eliminates that constraint. Installation is straightforward for technicians familiar with Hemi disassembly; the pump bolts directly into the factory mounting location without block modification.

OEM replacement and performance upgrade applications are the primary use cases. Street engine builders, off-road truck owners, and marine operators running Hemi powerplants standardly specify the M452HV when original factory pump capacity becomes the limiting factor for reliability or output. MELLING's reputation in OEM and aftermarket pump design provides confidence in fitment and durability across manufacturer-specified service intervals.