Well, as the SR and RB production lines died, we lost a lot of engine potential from nissan. The new VQ series stuffs apparently are not "over built" as much as the previous nissan giants. Personally I'm not sure if i'd use a VQ in any project over one of the 90's motors.

But the real question is if nissan will ever make motors similar to the 90's ones ever again. Or will they go forced induction in the forseeable future. Logic points to no since they are cutting costs and trying to make financial gains. They are also being more environmently consious hence no more FI

All i can say is that once they get outta the financial rut, that they bring back the inline 6 in like a RQ or something, and have a 4 cyl of the same configuration. This would be more cost effective than CA + SR + RB + VG + KA + whatever, and be able to revive the silvia and skyline nameplates..