My buddy just got a 92 hatch. LS/VTEC (b16 head) with a garrett t3 turbo, built pretty stout. stock sleeves. There is one imperfection. Previous owner installed ARP head studs and all of them but one are in. the last one is the stock bolt. We thought it was the radiator (it was the stock d16 radiator), so we put my larger radiator on there, and that didnt solve it. If he stays out of boost, it doesn't overheat. After he gets on it, even one or two pulls at 3/4 throttle, shortly after the temp gauge shoots up. Thermostat has recently been replaced. All hoses hold pressure. No leaks apparent, no white smoke, nothing. Just is overheating. Any ideas?