Anyone know what size socket to use for the drain plug on the engine block in order to drain the antifreeze??

 

On the block, or the radiator?

if you're just doing a regular drain/flush/fill, then there's a stopcock at the bottom of the radiator made for that purpose.. it'sgot a small hose hanging off it, and some little "fins" to turn it with.. it's pretty tight though, and be careful as it's plastic.. don't want to break that sucker off!

 

If you wanna get it all out, you gotta drain the block, too. There's a plug on the front side (VE) right behind the alternator, and one on the back right smack in the middle of the motor mount (or PS pump bracket, I don't remember which). I couldn't get the rear one out, but when I took out the front one it dumped about another gallon of coolant (after draining the radiator). It's about 15mm I think.

 

either 10mm or 15mm.