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on my 1989 it was on the passenger side on the bottom, but i had a 89 2500 3/4, my 2 cents There is one on each side of the block in the middle just above were the oil pan bolts on the engine. They have a 9/16 head and are short.

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Q: On a 1989 Chevrolet 1500 4X4 where is the two engine block drain plugs located to flush the radiator?
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