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ACL main bearing set for Nissan RB25 and RB30 engines, oversized by 0.50mm, supplied as a Race Series high-performance main bearing kit. It provides the correct oversize fit for rebuilt or machined blocks, letting installers replace worn mains with a matched set. Use when reconditioning the crank journal to specified 0.50mm undersize tolerances during engine rebuilds.
ACL Nissan RB25/RB30 0.50mm Oversized High Performance Main Bearing Set
