Perfect Circle MS829H10 H-Series Main Bearing Set Big Block Chevy .010 Undersize

The Perfect Circle MS829H10 is a high-performance H-Series main bearing set designed for Chevrolet big block engines. This precision-engineered bearing set features a .010 inch (.25mm) crankshaft undersize specification, making it ideal for machined crankshafts requiring an undersize bearing.

Key Features:

• Tri-metal construction with hardened steel backing, copper-lead intermediate layer, and lead-tin-copper overlay
• Half-groove (180 degree) oil distribution design on upper bearings
• Developed for NASCAR racing but suitable for all competition engines
• High crush factor for improved bearing retention
• Medium level of eccentricity to compensate for bore distortion at high RPM
• Enlarged chamfers for greater crankshaft fillet clearance
• No flash plating on bearing backs for better seating and heat transfer

Perfect Circle H-Series bearings are specifically engineered for engines running at medium-to-high RPM ranges. The tri-metal design reduces friction and drag while the carefully selected overlay provides excellent wear characteristics and durability in demanding performance applications.