King Engine Bearings MB 558XPC 020 pMaxKote Main Bearing Set Chrysler 273 318 340

The King Engine Bearings MB 558XPC 020 is a complete main bearing set designed for Chrysler small-block engines, featuring King's advanced pMaxKote polymer coating technology. This is part of King's performance racing line, engineered to deliver superior protection and reduced friction under high-load and high-RPM conditions.

King's pMaxKote overlay is a dry-film polymer coating applied to the bearing surface that reduces friction during cold starts and break-in, provides a sacrificial wear layer for added protection during momentary oil film breakdown, and improves overall bearing durability in both street and race applications.

Key Features:

• Part of King's premium pMaxKote racing line — polymer coated bearing surface
• Engineered for Chrysler 273, 301, 313, 318, and 340 cubic inch small-block engines
• 0.020" (0.50mm) undersize — designed for use with reground crankshafts machined 0.020" under standard
• Tri-metal bearing construction with copper-lead or aluminum alloy substrate for strength and conformability
• Precision manufactured to OEM dimensional tolerances for correct oil clearance
• Polymer coating reduces startup wear and acts as a protective layer during oil starvation events
• Suitable for high-performance street, strip, and racing applications

The MB 558XPC 020 is ideal for engine builders rebuilding Chrysler A-series and LA-series small-block engines with reground crankshafts. The pMaxKote coating makes this set especially well-suited for performance and competition builds where bearing durability and friction reduction are critical priorities.