ACL Bearings 5M1705-040 Race Series Main Bearing Set Undersize - 040

The ACL Bearings 5M1705-040 is a precision-engineered main bearing set designed for demanding performance applications. This .040" undersize bearing set is part of ACL's renowned Race Series, manufactured to exacting tolerances to deliver reliable operation under high-stress conditions.

Key Features:

• Tri-metal copper alloy construction provides exceptional strength and excellent seizure resistance
• Manufactured to micron-level tolerances ensuring consistent wall thickness and reliable fit
• Increased crush for improved bearing retention in the housing
• Elimination of flash plating on bearing backs maximizes heat transfer and improves grip
• Increased eccentricity compensates for bore distortion at high RPM and assists in hydrodynamic oil film formation
• 3/4 grooved design optimizes bearing load carrying surface area and oil flow to connecting rod bearings
• Enlarged ID chamfers accommodate large fillet radii on performance crankshafts
• Hardened steel backing provides superior support for the bearing lining

ACL has been manufacturing precision engine bearings in Tasmania, Australia for over 70 years, serving as an OEM supplier to major automotive manufacturers while maintaining a global reputation for quality, precision, and performance. Their Race Series bearings are proven components in championship-winning engines across multiple racing disciplines, from sport compact applications to professional motorsports.

Note: This is a .040" (.040 inch) undersize bearing set designed for reground crankshafts. Verify proper clearances during installation and ensure crankshaft has been machined to the appropriate undersize dimension.