6.4 HEMI Top End Rebuild Kit with MDS Lifters Upper Head Gasket Kit and Head Bolts FITS 6.4L V8 HEMI Chrysler Dodge Charger Jeep Charger Challenger Cherokee SRT-8 5038785AD 5038786AD

Professional Installation Recommended

This kit is intended for major internal engine and cylinder head service. Installation should be completed by a qualified machinist, engine builder, or automotive technician familiar with 6.4L HEMI MDS engines.

Camshaft Inspection Required

A failed or collapsed lifter can damage the corresponding camshaft lobe. The camshaft should be inspected carefully before installing the replacement lifters. Installing new lifters on a worn or damaged camshaft may result in recurring valvetrain noise, misfires, or premature component failure.

Recommended Inspection Procedures

• Inspect all camshaft lobes and journals for scoring, pitting, or abnormal wear.
• Inspect the camshaft bearings before engine assembly.
• Check rocker arms, rocker shafts, pushrods, and related valvetrain components.
• Inspect the MDS solenoids and associated oil-control passages.
• Check the cylinder heads for cracks, warpage, and damaged sealing surfaces.
• Inspect valve guides, valve seats, springs, retainers, and locks.
• Clean all engine oil passages and internal surfaces thoroughly.
• Remove all metallic debris caused by the original lifter or camshaft failure.
• Verify adequate engine oil pressure before returning the vehicle to service.
• Prime the lubrication system before initial startup.
• Follow the factory cylinder head bolt torque sequence and tightening procedure.
• Use new engine oil and a new oil filter after assembly.

Fitment Notice

This kit is intended for select 6.4L 392 HEMI engines equipped with the factory Multi-Displacement System. It is not intended for non-MDS engines or MDS-delete conversions.

Exact application years were not included in the supplied listing information. Vehicle model alone does not guarantee compatibility. Confirm the VIN, production date, engine configuration, original front and rear lifter designs, gasket configuration, and reference part numbers before purchasing.

Warranty Information

The stated lifetime warranty applies when the kit is installed by a certified machinist and remains subject to the manufacturer’s complete warranty requirements. Documentation of professional installation may be required.

Warranty coverage may not apply to damage caused by improper installation, inadequate lubrication, contaminated oil passages, insufficient oil pressure, overheating, unresolved camshaft damage, or failure to correct the original cause of engine failure.