I have a 1936 Chevy pickup with a 235, Offy dual carb intake, Rochester model B carbs, and fenton headers. I had the original radiator and never had any problems with overheating. Two years ago I had a valve stick, bent a pushrod and broke a rocker arm. I had the head redone with hardened seats, guides and valves ground. The block was hot tanked and bored .30 over. I installed a new Howards solid lifter cam. While I had the truck apart I decided to add A/C, it came with a condenser that covers most of the radiator. While I was breaking in the motor it overheated even though I had never had problems before I thought it was probably caused by a combination of the bore job, hotter cam and the condenser. My solution was to replace the radiator with a new Walker radiator. This radiator is thicker and sets back closer to the engine so I was no longer able to run the mechanical fan and I had to install a pusher fan in front of the radiator mounted on the condenser. The truck still overheats if it just setting idling but it seems to be OK if I am traveling down the road. I have changed the water temperature gauge, sending unit, water pump, thermostat twice, checked the timing, and burped the system. I have put about 7000 miles on the truck since the rebuild it runs great but I always have to worry about getting caught in traffic because it wants to overheat. My next idea is going to be to take the condenser off the front of the radiator, mount a larger fan and install a remote condenser. Does anyone have any ideas? Thanks.