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Hemis have a habit of leaking at the front and back of the heads at the large coolant passages(see outward bump in head casting),pressurize the system amd check these areas for coolant leaks.

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Yep. Sometimes if it just a suttle leak radiator pellets will fix it. Go to a GM dealer and buy them, they work really well.

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Always check the head gaskets in this area since the block and heads coolant holes vary from manufacture to manufacture.We usually put silicone around these areas for extra insurance.