just built two motors and whent through the same thing i could not find any head gaskets with these holes so i punched them my self, word to the wise do not drill them make a punch and punch them on a block of wood, and by the way it will or should i say it has for me, keep your valve train cooler, which in turn, makes the motor run a little better, and helps keep the engine cooler as a whole. so in short form i can`t figure out why chrysler didn`t have these open from the factory either, but mine will be open from now on.