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Where is the engine block drain plug on Chevy 305?

The engine block drain plug on a Chevy 305 small-block V8 is located at the very bottom of the engine block, on the passenger side (right side when looking at the engine from the front). It's usually a fairly large bolt, often slightly recessed.

However, it's crucial to consult a repair manual specific to your year and model of Chevy 305. The exact location might vary slightly depending on the year of manufacture and any modifications to the engine. A repair manual will provide a diagram and detailed instructions to ensure you drain the coolant properly without damaging anything. Improper draining can cause damage to the engine or cooling system.