King Engine Bearings MB5799XPGSTDX pMaxBlack Tri-Metal Race Main Bearing Set STD Extra Oil Clearance

The King Engine Bearings MB5799XPGSTDX is a pMaxBlack™ tri-metal race-grade main bearing set designed for the Subaru FA20 and Toyota 4U-GSE engines. This set features an oversize housing dimension of +0.005" and is built to the STDX (standard extra oil clearance) specification — ideal for high-performance and race engine builds requiring additional oil film thickness for improved lubrication under extreme loads.

King pMaxBlack™ Technology:

• Tri-metal construction — steel backing, copper-lead intermediate layer, and a proprietary pMaxBlack™ overlay optimized for race applications
• pMaxBlack™ overlay features a proprietary non-scaled hardening process that delivers superior load capacity compared to standard electroplated overlays
• Extra Oil Clearance (STDX) — provides increased oil clearance at standard journal sizing, promoting better oil flow and reduced heat buildup in high-RPM applications
• O/S Housing .005" — accommodates bored or oversized main bearing housings to restore correct oil clearance
• Tight wall thickness tolerances (±0.0001") for precise crankshaft fitment
• Designed and validated for demanding race and performance engine environments

King Engine Bearings has specialized exclusively in engine bearings since 1960, applying lessons learned from motorsport to every product in their lineup. The pMaxBlack™ series represents their top-tier race bearing technology, trusted by professional engine builders worldwide for builds where durability and load capacity are non-negotiable.