I need to find a screw+washer on the engine block for a b16a2. Im trying to flush my coolant and it says in the owners manual I need to unscrew it and let it drain. I know its somewhere around the exhaust headers and that its hard to find, can anyone point me more specifically to it. The absolute best thing would be if someone could take a pic of their engine and circle the screw in photoshop or something, thanks!