King Bearings SI-Series Performance Crankshaft Main Bearings +0.25mm for Select Nissan & Infiniti 2007-2024 (MB4524SI0.25)

Fits select 2007-2024 Nissan and Infiniti models including 350Z, 370Z, GT-R, G35, G37, Q50, and Q60 (VQ35HR / VQ37HR / VR38DETT).

King Bearings SI-Series performance main bearings are engineered for modern engines that require high-precision clearances and superior fatigue resistance. These bearings feature a silicon-aluminum alloy construction, providing a high-load capacity and excellent wear resistance for high-RPM applications. This specific set is sized at +0.25mm (0.010" oversize) for use with crankshafts that have been ground to a corresponding undersize during the machining process.

Whether rebuilding a VR38DETT for forced induction or refreshing a VQ-series V6, these bearings ensure consistent oil film thickness and reliable crankshaft support. The SI-Series is designed to withstand the thermal and mechanical stresses found in performance street and light track use, making them a direct-fit replacement for worn OE components in high-performance Nissan and Infiniti powerplants.

• Manufacturer Part Number: MB4524SI0.25
• Bearing Series: SI-Series (Silicon-Aluminum)
• Size: +0.25mm (0.010") Oversize
• Engine Compatibility: Nissan VQ35HR, VQ37HR, and VR38DETT
• Material: High-strength silicon aluminum alloy for enhanced fatigue life
• Precision-ground for exact oil clearances and consistent hydrodynamic lubrication