The D within the engine code means dual overhead camshaft (DOHC). This is certainly achieved by fitting an RB25DE or RB26DETT cylinder head and or turbo to a standard RB30E/T block. The RB25DET is just not normally used. Diamond Engineering is often a globe's top rated level machining organization, specialised https://cristiancdczy.answerblogs.com/28422718/nissan-rb26-engine-an-overview