Ours ran just over 10,500 and was good enough to win us 2 track championships. We locked it down a bit so lil man could flat foot it.
No engine builder will tell me what to use for obvious reasons but what I got out of him is the less squish the higher compression but be careful not to go to low that you fail tech because of cc’s so I am pretty sure I can go down safely to the .010The squish or the power output ?
Port height would change slightly with the base gasket as well .
Listen to Jimbo. He knows what he is talking about!He may have just spent a boat load of money to have it refreshed / blueprinted by a professional.
If you have not had this done to your Comer get used to what happened or spend less money and put a 206 on his kart.
You will spend less money buying a 206 than you will having your Comer blueprinted by someone that knows how to make them fast.