Federal Mogul 4664M20 Engine Main Bearing Set Oversize - 0.020

The Federal Mogul 4664M20 is a complete engine crankshaft main bearing set engineered to restore proper oil clearances and crankshaft support in worn or reground engines. This set is sized at 0.020" oversize (the "M20" suffix denotes the 0.020" undersize journal designation), making it a direct replacement for engines that have had their crankshaft main journals ground 0.020" undersize during rebuilding.

Federal Mogul is a globally recognized OEM and aftermarket supplier with decades of engineering expertise in engine bearing technology. Their main bearing sets are manufactured to precise tolerances to ensure proper oil film thickness, reduced friction, and long-term durability under high-load engine operating conditions.

Key Features:

• Complete main bearing set for full crankshaft support
• 0.020" undersize (oversize) specification for reground crankshafts
• Precision-engineered to OEM tolerances for consistent oil clearance
• Multi-layer construction for superior load capacity and wear resistance
• Correct wall thickness for proper crush and retention in the bearing bore
• Suitable for use in engine rebuilding and performance restoration applications

Federal Mogul main bearings are a trusted choice among professional engine builders and rebuilders. This 0.020" undersize set ensures a proper fit when the crankshaft main journals have been machined, delivering reliable performance and helping to achieve a long-lasting engine rebuild.