Any Honda B16 that threw a rod with only a 50 shot had a bad install. I put 75 shots on stock B16s all the time and have never had one break - ever. I did six 100 shot installs on mostly stock B16s last year and they are all still running (although they have toasted a few clutches).

99% of the time when a motor gets hurt on laughing gas it is for one of two reasons:

1) Too lean
2) Wrong timing

You HAVE to add fuel if you add oxygen or your cylinder temps will go through the roof. That's why I almost always install wet kits. You guys can really simplify your lives with one as you can run a dedicated fuel line & regulator.

The other issue is ignition timing. Unless you are running a very small shot, you need to retard the timing a few degrees. What breaks the motor with bad timimg is high cylinder pressures, because the fuel is burning before the rods turn over. You CANNOT throw a rod or lift the heads unless the fuel is burning before the rod turns over. There are a variety of gadgets that will pull timing automatically when you spray. Use one.

I also recommend a window switch set to cut off right before your redline. The last thing you want to do is hit the limiter while spraying. You will instantly go lean. Then stuff breaks. The window switch can also be used to keep you from spraying at too low of an rpm. It is really nice to have.

Once you use N2O, you will pity those without it.

Hope this helps. I don't check the forum often, so feel free to e-mail questions directly.