ACL Bearings 4B1185-1.00 Connecting Rod Bearing Set Standard Size

The ACL Bearings 4B1185-1.00 is a high-performance tri-metal connecting rod bearing set designed for Mitsubishi 4G63, 4G63T, and 4G64 engines. This 1.00mm (approximately 0.040") oversize bearing set is engineered for engines with reground crankshafts that require oversized bearings to maintain proper oil clearances.

Key Features:

• Tri-metal construction with hardened steel backing for superior strength and durability
• High-strength overlay with reduced thickness for improved fatigue resistance
• Hardened steel backs on all rod bearings improve bearing lining support and retention
• Increased crush for improved bearing retention in the housing
• No flash plating on bearing backs to maximize heat transfer and grip
• Increased eccentricity to compensate for bore distortion at high RPM
• Enlarged ID chamfers to accommodate larger fillet radius on performance crankshafts
• Tight wall tolerances for consistent oil clearances

This complete set includes 8 bearing halves for 4 connecting rods. ACL Race Series bearings are precision-manufactured to exacting tolerances and designed to withstand higher RPM conditions in both street performance and racing applications. Cross-references to OEM part number MD195939.