Make no mistake; when it comes to "specific output" (power per cubic inch) a 170 will beat the tail off a 225... That is important in NHRA class racing (where classes are determined by a car's weight divided by its displacement.)
In fact it will beat almost any 2-valve-per cylinder, inline six because it can REV to the moon!!!!
That type of racing is rare these days, though, and it has a hard time keeping up with a 225 in the real world because of the 225's advantage on sheer size, on the street.
