Federal Mogul LS1 A-Sereis Rod Bearings 8-255A

Bearing shells produced in steel and lined with aluminum/tin or aluminum/tin/silicon have extremely good anti-friction properties combined with high wear strength and exceptional resistance to corrosion. The fairly soft tin provides good conformability of the bearing to the crankshaft and is an excellent surface for embedment of dirt particles occurring as wear debris and primary dirt in the engine oil. Silicon, as an alloying element in aluminum bearings, is necessary when using cast iron crankshafts, especially soft shafts. The silicon smoothes the crankshaft surface to overcome any folded and smeared metal that might be covering up carbon inclusions.