ACL Bearings 4M960P-40 Main Bearing Set Standard Tri-Metal

The ACL Bearings 4M960P-40 is a precision-engineered main bearing set designed to support the crankshaft in demanding engine applications. ACL Race Series performance engine bearings are recognized as a premier brand throughout the motorsports world, with the unique combination of design, metallurgy and engineering providing endurance and capability to perform where others cannot.

Key Features:

• Precision manufacturing with exacting tolerances and particular attention to wall thickness accuracy ensures reliable fit and helps maintain consistent clearances
• Tri-metal construction with lead-tin-copper overlay for high strength and excellent seizure resistance
• No flash plating applied to improve bearing retention and maximize heat transfer
• Undersize specification (.040" / 1mm) designed for reground crankshafts
• Complete main bearing set for full crankshaft support

ACL Race series bearings can be assembled with .00075" – .001" per 1" of journal diameter (0.020-0.025mm per 25 mm of journal diameter) plus 0.0005" (0.013 mm), providing optimal oil clearance for performance applications. The advanced metallurgy and engineering make these bearings suitable for both street and competition use.