King Bearings MB 557SI 020 Alecular Main Bearing Set, 0.020-Inch Undersize

The King Bearings MB 557SI 020 is a main bearing set designed for Small Block Chevy applications. This kit features an Alecular bearing construction and a 0.020-inch undersize specification for applications requiring that bearing size.

Engineered as a replacement main bearing set, this product is identified by part number MB 557SI 020 and is supplied by King Bearings. Its application-specific design makes it important to verify the required bearing specification before installation.

The set is listed as not air restricted and not truck freight only, supporting standard handling classifications. Use the part number and 0.020-inch undersize specification to confirm it matches the intended engine rebuild or service requirements.

Features:

• Brand: King Bearings
• Part Number: MB 557SI 020
• Product Type: Main bearing set
• Bearing Design: Alecular
• Bearing Size: 0.020-inch undersize
• Application: Small Block Chevy