Victor MS909H20 H-Series Crankshaft Main Bearing Set .020 Undersize Tri-Metal

The MS909H20 is an H-Series crankshaft main bearing set designed for performance and competition engine applications requiring a .020 in. (0.50mm) undersize crankshaft. This tri-metal bearing set features a hardened steel back with a carefully selected thin overlay, delivering the durability and precision required for demanding engine builds.

Key Features:

• H-Series performance design with medium eccentricity and high crush factor for positive, consistent seating
• Tri-metal construction with hardened steel backing and thin overlay for superior wear resistance
• Half-groove (180°) oil groove design for optimized lubrication
• Enlarged chamfers at bearing sides for greater crankshaft fillet clearance — compatible with aftermarket high-performance crankshafts with oversize fillets
• No flash plating for improved bearing-to-journal seating and break-in
• .020 in. undersize crankshaft journal diameter (0.50mm)

Originally developed for NASCAR racing, the H-Series main bearing design is well suited for all forms of competition engines as well as high-performance street builds. These bearings are especially effective in engines operating in the medium-to-high RPM range. Compatible with Small Block Chevy V8 engines.