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Engine block drain plug and pet cock install

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03-27-2026, 06:40 PM	#1
mike16 Senior Member Join Date: Dec 2009 Location: bisbee, arizona Posts: 1,609	Engine block drain plug and pet cock install What size Allen wrench fits these drain plugs in the side of my 72 307? I want to install pet cock style drain valves in this location. What size threads or a part number for the correct drain valve? Any advice on removing these plugs while the engines in the truck. Thanks all!! Attached Images

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