i recently got my z28 running good, real good. the only bad thing is that myo verflow resevoir has a huge hole in it. when i drive about 3 or 4 miles, and i park it, i notice that there is fluid boiling inside it. i bought a 15 pound radiator cap, so i know its not that. the motor was recently bored, so i dont think its the head gasket. any other ideas??????????

 

last time i had bubbles in my overflowflow tank i hadn't bled the system well enough.

the time before that was when i had a cracked head.