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For a proper coolant flush, drain the block as well as the radiator. You can even use a coolant flush if you do this if you want.
Block drains are above the "wings" on each side of the rear of the oil pan. You can guide a 5 mm hex head socket up in there on a u-joint. Maybe you could see with an inspection mirror but I am not sure. The header secondary is in the area also so space is tight. They are clearly visible with the oil pan down, but you can access them with the pan in place. A little messy since the coolant will come pouring out and you cannot exactly direct its flow if the pan is in place. Obviously, do each side.
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