These GLYCO main bearings, part number 71-4378/8 STD, are engineered to provide robust support for your engine's crankshaft. Crafted with precision, they ensure proper alignment and reduce friction, contributing to smoother engine operation and extended component life. The STD designation indicates standard size, ensuring a precise fit for compatible applications. Choosing GLYCO means opting for reliability and performance. These bearings are built to withstand the demanding conditions within an engine, offering consistent protection and efficiency.