The D in the engine code means twin overhead camshaft (DOHC). This really is attained by fitting an RB25DE or RB26DETT cylinder head and or turbo to a regular RB30E/T block. The RB25DET is not typically used. It’s not unusual for GT-R fanatics to sidetrack and talk about Z-tunes and https://rb26detforsale04703.blogvivi.com/28794620/rb26-engine-for-sale-an-overview