King Engine Bearings Chevrolet 151/153 (Size STD) Main Bearing Set

The King Engine Bearings MB5532SI is a set of SI-Series main bearings designed for OE applications. These replacement bearings are suitable for aftermarket gasoline or diesel engine rebuilding and performance engines with factory crankshafts.

They feature an improved crankshaft finish to reduce microscopic ferrite peaks on improperly ground or polished nodular cast iron crankshafts. The SI-Series main bearings also offer improved oil clearance, which helps reduce wear, increase engine life, and decrease operating noise, vibration, and excess oil flow. The set includes 5 bearings and is a direct replacement part. The material is a bi-metal, silicon aluminum compound, and the bearings are grooved, with the groove located in the upper position and a 1/2 groove style. The crankshaft undersize is stock, as is the thrust bearing oversize.