This GLYCO main bearing, part number 71-3988/4 0.50mm, is designed to provide essential support for your engine's crankshaft. Manufactured to exacting standards, it ensures proper alignment and reduces friction, contributing to the overall health and efficiency of your engine. The 0.50mm undersize specification indicates this bearing is intended for use when the crankshaft journals have been machined to this dimension due to wear or for performance tuning. Proper installation of the correct undersize bearing is critical for maintaining correct oil clearances and ensuring the longevity of your engine components. GLYCO is a recognized name in engine bearing technology, known for producing reliable components that meet or exceed original equipment specifications. Choosing this GLYCO bearing means opting for quality and a part that is built to perform under demanding conditions.