The D while in the engine code means twin overhead camshaft (DOHC). This can be attained by fitting an RB25DE or RB26DETT cylinder head and or turbo to a standard RB30E/T block. The RB25DET is just not typically used. Anyway… If a crank contains a 0.02mm runout, that means it https://damienkqrng.answerblogs.com/28415813/the-smart-trick-of-nissan-skyline-rb26-that-no-one-is-discussing