Why is my 1991 corvette convertible overheating?

phantom528

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I have a 1991 chevy corvette with a 5.7L engine. I am having problems with temperature gauge showing 260 degrees F at the red line when the vehicle sits running at idle after 10 minutes. I have flushed the radiator, put in a new water pump, put in a new thermostat, and replaced the secondary radiator fan relay. What else could be causing the vehicle to overheat? I have spent countless hours doing these repairs with my father-in-law and have spent over $150 in parts... Any suggestions at all will be appreciated... thank you ahead of time
of course we have checked the oil and that has nothing to do with it unless it had a cracked head which it doesnt
 
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