Clevite P-Series Main Bearing Set 01-16 GM 6.6L Duramax LB7/LLY/LBZ/LMM/LML

Whether you're rebuilding a dependable tow rig or assembling a high-performance engine, the Clevite P-Series Main Bearing Set delivers the strength and durability your Duramax demands. Designed for 01–16 GM 6.6L Duramax engines, these premium tri-metal main bearings are available in Standard, 0.25mm Undersize, and 0.50mm Undersize to match your crankshaft after machining or during a complete engine rebuild. Engineered for increased load capacity and superior oil control, P-Series bearings are the preferred choice for stock replacements, towing applications, and high-horsepower diesel builds. Built with Clevite's proven P-Series TM-77 tri-metal construction, these main bearings feature a hardened steel backing, high-strength copper-lead intermediate layer, and precision bearing surface for exceptional fatigue resistance under extreme cylinder pressures. The full-groove upper bearing design maximizes oil flow for improved lubrication, while the high-crush construction provides superior bearing retention, and the reduced overlay thickness helps resist overlay fatigue in demanding diesel applications. Undersized bearings require a properly machined crankshaft that has been rehardened with a nitride heat treatment. Whether your Duramax is built for work, towing, or competition, Clevite P-Series main bearings deliver the reliability that professional engine builders trust.