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Found this Wikipedia: Nissan RB engine - Wikipedia, the free encyclopedia

The RB engine is a 2.0L to 3.0L straight-6 piston engine from Nissan.

It has an aluminum head with both SOHC/DOHC versions, with the SOHC versions having 2 valves per cylinder and the DOHC versions having 4 valves per cylinder, all cam lobes move only one valve. All RB engines have belt driven cams and a cast iron block. All turbo models have an intercooled turbo (except the single cam RB20ET & RB30ET engines), and most have a recirculating factory blow off valve (except when fitted to Laurels and Cefiros) to reduce boost surge when the throttle is closed.

Some sources indicate the 'RB' name stands for 'Race Bred'[1], although this is disputed. The Nissan CA engine is a 4 cylinder design derived from the RB engine
 

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Wiki is really nice, but I allways wonder where they get the sources for the content. Even Wiki don't know about the Race Bred myth thought.:(
 
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