These GLYCO main bearings, part number 71-4297/4 0.25mm, are crafted to meet stringent engine specifications. They play a crucial role in supporting the crankshaft, ensuring smooth rotation and reducing friction within the engine. The precision engineering of these bearings contributes to the overall health and longevity of your engine. They are designed to withstand the demanding conditions of internal combustion, providing reliable performance under various loads and temperatures. Properly installed main bearings are essential for maintaining oil pressure and ensuring that the crankshaft is correctly aligned. This set offers a 0.25mm undersize, suitable for crankshafts that have been machined to this specification. Choose GLYCO for quality engine components that deliver consistent results. These main bearings are a vital part of your engine's internal assembly, contributing to its efficiency and power output.