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There are two. One, each side, centered, right above the oil pan rail. They both take a 9/16ths socket, and juse a 6 point, as they will be tight. Once out, if the water does not flow, or, is flowing slow, clear the hole out with a screwdriver, as they rust over, sometimes.

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Q: Block coolant drain plugs located on a Chevy small block 305?
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