88 GMC K2500 Getting Too Hot.?

rustynail

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I've recently replaced the motor (350 4-bolt main) and everything is working as it should, but the temperature is getting too hot around 235 or 240 degrees and sometimes goes into the red zone. I've replaced the thermostat with a new unit and have new antifreeze and the system is full, but it is still getting too hot. Does anybody out there know what the problem might be, If so let me know. Thanks.
I forgot to mention that the truck has a new water pump, and there are no leaks. Also all the sensors were replaced with new units.
 
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