hey guys, its been a while since i've been on here. I'm having a problem with overheating and i'm 90% sure i've tracked it down to be the head gasket. I have replaced the radiator, thermostat, and i have the fans hard wired to come on with a switch. the motor was reciently rebuilt with a new water pump so i believe thats kosher.
The car only overheats when i go into boost, at this time the radiator overflow fills up and spits fluid out. also when i go to burb the system with the rad cap off bubbles keep coming up. I don't see any signs of oil in my rad fluid but i have only had the fluid in the rad for 10 miles or so. I can't see any white smoke either.

the engine is a mini-me with a t-25 tunable ecu and other goodies.

 

could be a leaky HG, warped head or block because pressure is going into your coolant system when u hit boost. best way to check is do a leakdown test, good luck man