King Engine Bearings MB4049SI0.25 Main Bearing Set Oversize for Opel - 0.25mm C25XA X25XA

The King Engine Bearings MB4049SI0.25 is a precision-engineered main bearing set designed specifically for Opel C25XA and X25XA engines. This set features King's SI-Series bi-metal construction with an aluminum base strengthened by 2.5-3% silicon content, making it ideal for medium-load applications and engines equipped with nodular cast iron crankshafts.

Key Features:

• SI-Series bi-metal construction with aluminum silicon alloy (2.5-3% silicon)
• 0.25mm (0.010") oversize for precision crankshaft rebuilds
• Lead-free, environmentally friendly design
• OE-replacement quality for reliable performance
• 4-pair complete main bearing set
• Tolerance control up to +/- .0001" for exact fitment
• Steel backing with precision-finished aluminum bearing surface

King SI-Series bearings are specifically recommended for OE applications and aftermarket engine rebuilding. These bearings provide improved oil clearance to reduce wear and increase engine life, while also reducing operating noise, vibration, and excess oil flow. The SI-Series material is engineered to handle the demands of nodular cast iron crankshafts commonly found in European engines, with an improved crankshaft finish that reduces microscopic ferrite peaks on improperly ground or polished surfaces.

This 0.25mm oversize bearing set is designed for use when crankshafts have been ground to accommodate slightly larger bearings during rebuild procedures. Each bearing shell is stamped with its size on the steel backing for easy identification during installation.