ACL Bearings 4B1691-050 Performance Connecting Rod Bearing Set Undersize - 050

The ACL Bearings 4B1691-050 is a high-performance connecting rod bearing set designed for precision engine builds requiring .050 inch undersize bearings for reground crankshafts. This Race Series bearing set features ACL's advanced tri-metal construction with a hardened steel backing for improved bearing retention and enhanced heat dissipation under extreme operating conditions.

Key Features:

• Tri-metal design with high-strength overlay for superior fatigue resistance
• Hardened steel backing provides improved retention and thermal transfer
• .050 inch undersize for use with reground crankshafts
• Precision-manufactured to exacting micron tolerances for consistent wall thickness and crush
• Race-proven metallurgy delivers performance where others cannot
• Complete set includes bearing halves for all connecting rod positions
• Dark tarnished appearance from electroplated copper overlay (normal characteristic)

ACL Race Series bearings are trusted by professional engine builders and have proven themselves in demanding motorsports applications from drag racing to road racing. The advanced materials and manufacturing processes ensure reliable operation under high loads, elevated RPMs, and extreme temperatures. Each bearing set is manufactured to maintain consistent oil clearances and proper crush for optimal engine protection and longevity.