All depends on if your valves and walls can take it. Long rods=more stress=less rpm's. If you don't obey the red line of your engine, chances are it won't last as long. Pure and simple.
Here are the B20, 18 and 16 specs...
http://hybrid2.honda-perf.org/tech/b20/b20tech.html
You will see the B16 has more horsepower, but now you know why it does, and you will know why it won't win the race.