The D in the engine code stands for twin overhead camshaft (DOHC). That is attained by fitting an RB25DE or RB26DETT cylinder head and or turbo to a typical RB30E/T block. The RB25DET will not be typically used. In 1995, Nissan revamped the RB25 sequence and manufactured a number of https://rb26dett-engine-for-sale15790.blogerus.com/50948158/indicators-on-rb26-motor-for-sale-you-should-know