Well i took my car to the track and every time it sits it overheats it has done this since the carb swap. It has a 6 month old radiator and water pump, 160 thermostat, and a hypertech fan switch and the other fan is on a toggle switch. Runs at around 160 or lower at driving speed then when im sitting still at idle it slowly creeps up to 240.

 

Whats your fan setup belt or electric? it might be a lack of air flow, either your fan isnt pulling enough air through or your rad is blocked by somthing you didnt forsee... so whats your setup give us some more info it will be easier to diagnose...-RevZ28

 

its just a stock 89 serpentine setup with a carquest mechnicle water pump, stock dual fans and a stock replacement radiator.

 

Are your fans pulling enough air through the rad to cool it down. What kinda of fans are you running are they stock? Or aftermarket.-RevZ28