This GLYCO main bearing set, part number 71-3507/4 with a 0.25mm undersize, is engineered to provide superior support for your engine's crankshaft. Crafted with precision, these bearings are essential for reducing friction and wear within the engine block, contributing to a longer lifespan and more efficient operation. The 0.25mm undersize specification is crucial for applications where crankshaft journals have been machined to accommodate bearing wear. Choosing GLYCO ensures that you are using components designed to meet stringent manufacturing standards. This set is vital for maintaining the integrity and performance of your engine, especially after repairs or rebuilds. Proper installation of this main bearing set is key to achieving the intended benefits. It plays a critical role in maintaining oil clearances and ensuring the crankshaft rotates freely and securely within the engine block.