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Unfortunately these engines have a poor coolant flow to the rear of the block which causes the rear to run as much as 50 degrees hotter than the front. The cooling system overall temperature will not necessarily show this as it it looking at overall system temperature which is being regulated...

Could be blown head gaskets or cracked cylinders as ken said. A chemical head gasket tester kit can be had for little money and with a sniff of the coolant will tell if you have combustion gasses in the coolant.