The D in the engine code stands for twin overhead camshaft (DOHC). This really is completed by fitting an RB25DE or RB26DETT cylinder head and or turbo to a standard RB30E/T block. The RB25DET is just not ordinarily used.What more am i able to say. You guys normally have the ideal gear to save lots of the day for me. Was dealing with it with a cust