MAHLE MS-829H-20 H-Series Engine Crankshaft Main Bearing Set .020" Undersize Big Block Chevy

The MAHLE MS-829H-20 is an H-Series crankshaft main bearing set designed for high-performance Big Block Chevrolet engines, ground to a .020" (20 thousandths) undersize for use with reground crankshafts.

H-Series Performance Design:

• Exclusive three-layer construction rated to carry maximum loads up to 12,000 psi
• Cast copper-lead alloy intermediate layer delivers approximately 20% greater fatigue strength versus sintered/powdered metal competitors
• Precision steel backing layer provides structural rigidity and excellent heat transfer
• Electroplated white metal "babbitt" surface layer minimizes friction, reduces drag, and increases horsepower
• Narrowed profile provides greater crankshaft fillet radius clearance
• Medium eccentricity helps minimize rod housing bore deflection and deformation under load
• High crush design ensures optimal heat transfer and resistance to rotation under minimal oil film conditions
• No flash tin plating — omitted by design for superior performance in high-load racing environments
• Contains half-grooved (1/2 grooved) upper bearings

Originally developed for NASCAR-style racing, the Clevite H-Series bearing line has become the benchmark for all types of competition and performance engine builds. MAHLE Clevite (MS-829H-20) is a direct-fit, drop-in replacement engineered to OEM tolerances with race-proven materials. Whether refreshing a worn engine or assembling a purpose-built performance motor, this set delivers the reliability and precision demanded by serious engine builders.