SI-Series Main Bearing Set

The King Bearings MB4549SI is a set of SI-Series main bearings crafted for direct replacement in specific Ford, Lincoln, and Mazda applications. The SI-Series utilizes a bi-metal construction with silicon aluminum, offering enhanced strength and durability. This material blend is ideal for medium-load engines and works particularly well with nodular cast iron crankshafts. These bearings feature an improved crankshaft finish to mitigate microscopic ferrite peaks on improperly ground or polished crankshafts, and they offer improved oil clearance to reduce wear, extend engine life, and minimize operating noise, vibration, and excess oil flow. The MB4549SI features a grooved bearing design, with the groove positioned in the upper 1/2 location. This set is sold as a set of 4 and is designed for stock size crankshafts. These bearings are intended for engines with a 3.5L V6 displacement. This part fits a wide range of Ford vehicles, including various models of the Edge, Expedition, and F-150, across model years from 2015 to 2019. For precise fitment, consult the detailed application list.