Main Bearing Set Nissan RB20/RB25/RB28/RB30

The ACL Bearings Main Bearing Set for Nissan RB20/RB25/RB28/RB30 (Part Number 7M2394H-STD) is a standard-grade H-series crankshaft bearing kit engineered for six-cylinder Nissan engines. This complete bearing set delivers reliable support for the crankshaft under load, maintaining precise tolerances critical to engine longevity and consistent performance across the full range of RB-series displacement variants.

ACL Bearings is recognized for OEM-quality bearing solutions that meet or exceed manufacturer specifications. The standard H-series designation indicates this kit meets stock tolerances, making it the preferred choice for rebuilds seeking factory-equivalent performance without premium pricing. The complete kit format ensures all main bearing positions are replaced simultaneously, maintaining uniform load distribution and preventing premature wear from mixed bearing materials or worn journals.

This bearing set is designed for engine builders, machine shops, and serious enthusiasts rebuilding RB20, RB25, RB28, or RB30 engines. Whether for performance restoration, high-mileage block refresh, or boost-ready preparation, these bearings provide the foundation for stable oil film and controlled journal wear. The standard grade suits applications running moderate boost levels or stock displacement without exotic fuel or ignition timing, making this kit ideal for street and light track use.

RB-series engines are prized in drift, motorsport, and street tuning communities for their robust iron block architecture and responsive throttle character. A quality main bearing set is non-negotiable for reliability in these applications. ACL's reputation for consistent dimensional accuracy across bearing sets ensures straightforward installation and predictable clearances with properly prepared journals.