King Engine Bearings MB4049SI0.75 Main Bearing Set Opel Oversized - C25XA X25XA 0.75mm

The King Engine Bearings MB4049SI0.75 is a complete main bearing set designed for Opel and Vauxhall engines equipped with the C25XA and X25XA 2.5L inline-6 engine configurations. This set is manufactured to a 0.75mm oversized specification, making it ideal for engines where the crankshaft journals have been reground to restore proper clearances during an engine rebuild.

King Engine Bearings is a globally recognized OEM and aftermarket bearing manufacturer known for precision tolerances, advanced alloy formulations, and superior surface finishes. Their bearings are engineered to meet or exceed original equipment specifications for oil clearance, crush, and surface hardness.

Key Features:

• 0.75mm Oversized – Designed for reground crankshafts, restoring factory oil clearances
• SI (Silicon-Aluminum) Alloy – Premium tri-metal or bimetal construction for enhanced wear resistance and fatigue strength
• Precision Tolerances – Consistent wall thickness for optimal oil film and reduced engine noise
• OE-Equivalent Fit – Direct replacement geometry matching original Opel/Vauxhall main bearing dimensions
• Complete Set – Includes all main bearings required for a full engine rebuild
• Surface Treatment – Engineered overlay for excellent conformability and embeddability of debris particles

This bearing set is a trusted choice for engine builders and professional rebuilders working on Opel C25XA and X25XA-powered vehicles. The oversized specification ensures proper fitment after crankshaft grinding, helping restore engine longevity and performance to factory standards.