Quote Originally Posted by rb240det
The RB's were cast iron all the way to the R34 GTR, which was discontinued in what...'00-'01? I hardly think it's outdated.
You can't tell me though that the block/headwork are too similar in those two motors though.

They share what the same iron block, other then that entirely different.

Don't get me started on rb20s and rb25s badass intake manifolds.