1989-2018 Cummins Performance Coated Main Bearings (PDM-MS-2328HC)

Clevite H-series coated main bearing set for 1989-2018 Dodge and Ram 5.9L/6.7L Cummins engines. The base-clearance coated variant — same Clevite race bearing pedigree, with the dry-film coating, without the added .001" of clearance that the HX series carries.

H-series bearings have hardened steel backs with thin overlay, medium eccentricity, and high crush. Enlarged chamfers provide more crank fillet clearance. No flash plating — bearings seat faster and more uniformly. The coating sits between the bearing surface and the crank journal, providing protection during cold starts and oil-starvation events when the oil pump hasn't pressurized the bearings yet. Moly and oil-retention additives in the coating hold film thickness under sustained load.

• Clevite H-Series Coated Main Bearings — Complete Set
• Hardened Steel Back with Thin Overlay
• Enlarged Chamfers for Crank Fillet Clearance
• Dry-Film Coating for Cold-Start Protection
• Moly & Oil-Retention Additives in Coating
• Fits 5.9L and 6.7L Cummins
• Part Number: PDM-MS-2328HC

• Plastigauge journals before final assembly to confirm clearance is in spec.
• For builds that need extra clearance — loose journals, sustained high RPM running — step up to the HX-series with +.001" added clearance (PDM-MS-2328HXC).