There is no replacement for displacement. There really is not. You can add technology to more displacement, and you will make more power, more torque. A popular swap for RB25/RB26 engines is to take the bottom end from an RB30 and add a RB25/26 head. They came in a lot of different cars around the world, just nothing here in the US. Here is an RB30 block for $550. Add some shipping, an RB26 head, and you have a good base for an engine. Do some pistons and rods, and it can be something really impressive.
![Photo_11-725811[1]](http://lh4.ggpht.com/_8MPCKJQzPA8/TJ5E3YloPbI/AAAAAAAA3pY/GctBLVMJZtk/Photo_11-725811%5B1%5D%5B2%5D.jpg?imgmax=800 "Photo_11-725811[1]")
