Nissan created the N1 block a bit diverse as opposed to common RB26 block, which is marked by using a 24U in lieu of 05U to differentiate it.The RB-X GT2 (designed and designed by REINIK) is really an engine specifically created for your NISMO 400R. The difference between this engine in addition to a RB26DETT is that the engine is bored and stroked