ACL Bearings 4M7295A-.25 Race Series Main Bearing Set Oversize - 0.25mm

The ACL Bearings 4M7295A-.25 is a high-performance main bearing set designed for precision engine rebuilds requiring 0.25mm (0.010") oversize bearings. Part of the renowned ACL Race Series, these main bearings are engineered to withstand the extreme demands of high-performance and racing applications.

Advanced Tri-Metal Construction:

• High-strength steel backing provides superior bearing support and retention
• Copper-lead alloy intermediate layer delivers excellent load capacity and fatigue resistance
• Thin overlay plate with reduced thickness for improved fatigue properties and conformability
• Enhanced embedability to absorb small debris and contaminants without damage

Race-Proven Features:

• 3/4 groove design optimizes bearing load surface area and oil flow to connecting rod bearings
• Increased eccentricity compensates for bore distortion at high RPM
• Precision-machined to micron tolerances for consistent wall thickness and crush
• No flash plating on bearing backs improves heat transfer and maximizes grip in housing
• Enlarged ID chamfers accommodate large fillet radius on performance crankshafts

Oversize Application:

The 0.25mm oversize dimension is specifically engineered for engine rebuilds where crankshaft journals have been machined down. This ensures precise fitment and proper bearing clearances in rebuilt engines, restoring optimal performance and reliability.

ACL Race Series bearings are the choice of championship-winning engine builders worldwide, proven in everything from sport compact drift racing to NASCAR, IHRA, and NHRA competition engines. These bearings deliver the strength, precision, and endurance needed to perform under extreme loads and sustained high RPM conditions.