Theoretically, the water wetter I put in should allow me to run straight water without any fun corrosive effects from aluminum head/iron block reactions. It also theoretically lubes the water pump, which is the other thing people say antifreeze is supposed to do. On top of that, I am running a little bit of antifreeze that I've dumped in at various times, just not a lot. If it ends up destroying my engine, well, I'll have proven that water wetter doesn't do what it should and I'll go pick up another shortblock for 100 bucks and slap my other head on it.