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

The 1989 Chevrolet 1500 4X4 does not have engine block drain plugs. Instead, it has a drain petcock for the radiator located at the lower right corner of the radiator with a plastic valve and 3/8 inch pipe plug installed under the oil-pan gasket just beneath the oil filter