This Clevite H-Series connecting rod bearing is a 0.25 mm undersize bearing for the GM Duramax 6.6L diesel V8. Clevite H-Series performance bearings use a medium level of eccentricity, high crush, a hardened steel back and a thin overlay, and are made without flash plating for better seating. They are intended for crankshafts with oversize fillets and for engines that run in the medium to high RPM range. It is sold individually.
Specifications:
- Type: Connecting rod bearing, H-Series (sold each)
- Construction: tri-metal with hardened steel back and thin overlay
- Size: 0.25 mm (0.010 in) crankshaft undersize
- Engine: GM Duramax 6.6L diesel V8
- Part number: CB1805H25MM
Engine Application: GM Duramax 6.6L diesel V8. The source listing does not state a year range, so confirm your engine before ordering.
FAQ
What engine does the Clevite CB1805H25MM fit?
It fits the GM Duramax 6.6L diesel V8.
What does 25MM mean in this part number?
It marks 0.25 mm (0.010 in) crankshaft undersize, made for a crankshaft whose journals have been ground under standard by that amount. Measure the journals before ordering.
Is this sold as a set?
No, it is sold individually (each). The Duramax V8 uses eight connecting rod bearings, so order eight for a complete engine.
What does H-Series mean?
H-Series is Clevite's performance bearing line. It uses a harder, higher-crush tri-metal construction designed for medium-to-high RPM use and crankshafts with oversize fillets.

