King Engine Bearings MB5212SI010 SI-Series Main Bearing Set 0.010 Undersize

The King Engine Bearings MB5212SI010 is a precision-engineered SI-Series main bearing set designed for OE replacement and performance applications on Chevy and GMC engines.

SI-Series Technology:

• Aluminum-based material strengthened by 2.5-3% silicon for medium load engines or nodular cast iron crankshafts
• Improved crankshaft finish for reducing microscopic ferrite peaks on improperly ground or polished nodular cast iron crankshafts
• Improved oil clearance to reduce wear and increase engine life, reducing operating noise, vibration, and excess oil flow
• Precision finished wall thicknesses that cannot be resized

Quality Features:

• Advanced quality control with bearing wall thickness tolerances at plus or minus 0.0001 inch
• Size stamped into steel back of each bearing shell for verification
• Bi-metal construction with silicon aluminum alloy
• Lead-free and environmentally friendly design

King SI-Series main bearings are recommended for OE applications, aftermarket gasoline or diesel engine rebuilding, and performance engines with factory crankshafts. The 0.010 inch undersize specification allows for proper fitment on crankshafts that have been machined or reground.