King Engine Bearings MB1336XPSTD-3 XP Series Main Bearing Set Standard Size

The King Engine Bearings MB1336XPSTD-3 is an XP Series crankshaft main bearing set in standard size, engineered for high-performance street and competition engine builds. Featuring King's advanced pMax Black tri-metal construction and precision geometric design, this main bearing set delivers the load capacity and durability demanded by serious engine builders.

XP Series pMax Black Technology:

• Tri-Metal pMax Black Structure — Enhanced copper/lead construction with nickel barrier layer, bonded via King's SecureBond adhesion process for superior layer stability and fatigue resistance
• 15–30% Greater Load Capacity — Outperforms conventional tri-metal race bearings, making it ideal for sustained high-load applications including road racing, circle track, and high-output street builds
• Bull's Eye Tolerance — All bearing shells are matched to within ±0.0001" wall thickness, among the tightest tolerances in the industry
• Enlarged Chamfered Oil Holes — Main bearings feature oversized, chamfered oil holes to promote superior oil delivery to crankshaft journals
• Narrowed Design — Main bearing width is reduced to accommodate large-radius crankshafts common in performance and aftermarket applications
• Medium Eccentricity — Optimized bearing geometry enables ideal load distribution and enhanced oiling across the journal surface
• RadiaLock Crush Height — Precisely controlled crush height ensures proper bearing retention and optimal oil film formation under extreme operating conditions
• Standard Size (STD) — Direct replacement for standard journal dimensions; no crankshaft machining required

King Engine Bearings has manufactured precision engine bearings exclusively since 1960, and the XP Series represents their race-developed solution for engines running forged steel crankshafts under sustained high loads. The MB1336XPSTD-3 main bearing set is suited for performance engine rebuilds where durability, precise fitment, and consistent oil clearance are critical.