freeze plug on 93 chevy k1500 4x4 4.3l V6 eng

Answer 1

There are 2 freeze plugs on the back of the engine block.  The fun part is that to get at them you must remove the transmission.  It's tons of fun, especially if you're doing it in your driveway, like I did.  The guy across the street had a motorcycle jack which proved very helpful for supporting the tranny and keeping it in a position that it could be reinstalled, not easily, but doable.