hello from another continent

We have long run around the models 450/500/800/1000 H.O. And this is what they noticed, if you put a set of blocks of 21 grams at 450 H.O we get a soft start, agility, additional "power". The maximum speed remains. We put 22 grams on the 500 engine, and 23 grams on the 800. Only a positive effect.
There is experience since I am a manufacturer of these blocks