King Engine Bearings MB 557XP010X pMax Black Race Main Bearing Set 0.010 Undersize

The King Engine Bearings MB 557XP010X is a complete main bearing set designed for General Motors small-block engines, including the 262, 267, 302, 307, 327, and 350 cubic inch displacements. This set is engineered to 0.010" undersize to accommodate reground or worn crankshafts, making it ideal for engine rebuilds and performance applications.

This bearing set features King's pMax Black XP trimetal construction — a race-grade bearing technology developed for high-performance and competition engines. The pMax Black coating is a proprietary DLC-inspired black polymer overlay that significantly reduces friction, improves oil film retention, and provides superior wear resistance under extreme load and RPM conditions.

Key Features:

• pMax Black XP Race Bearing Technology — advanced polymer overlay for friction reduction and scuff resistance
• Trimetal construction — steel backing, copper-lead or aluminum alloy intermediate layer, and performance overlay for maximum strength and conformability
• 0.010" undersize (010X) — engineered for use with crankshafts ground 0.010" undersize
• Complete main bearing set — includes all upper and lower half shells required for a full engine assembly
• Compatible with GM 262, 267, 302, 307, 327, and 350 small-block V8 engines
• Designed for high-performance street, track, and competition applications
• Manufactured to tight tolerances for consistent oil clearance and reliable performance

King Engine Bearings is a globally recognized manufacturer trusted by professional engine builders and race teams worldwide. The MB 557XP010X is an excellent choice for anyone rebuilding a GM small-block who demands race-proven reliability and performance from their engine bearings.