I have a 7mm cub on alcohol setup for drag racing, it leaks coolant out out the radiator overflow tube, i replaced the orings in the head twice and pulled it apart again yesterday to find out that all the orings look perfect.. When it warms up and idles theres a slow steady drip but when i punch the throttle then more fluid would shoot out..
maybe a flaw in the head or domes? maybe put in new orings again? im out of ideas.. its a 1 piece billet head btw