there are actually a couple problems with RBs(specifically rb26) ans swaping them in. First, they are heavy...really weigh down the front of a 240sx, but they do fit in that car. In japan, there are some Z32 Rb26 swaps, but because of the short front with a tall engine, it requires a pretty big hood cowl which looks a little akward, but on the other hand....its make for a pretty damn fast car in either.