Just did a drain and fill of the radiator.. what a mess.. and like they say coolant tastes sweet, YUK!

Anyway, just draining the radiator takes about 1.25 gallons and the total capacity is around 2.75 gallons so obviously ove half must be left in the engine block.

I did try to remove the engine block plugs but all I had was the 12-pt 14mm so I ended up stripping it before giving up. By the way, with a couple of ratchet extension (I used a 6" and a 2") along with one of those dual axis swivel extesions you can get at the left bank plug pretty easily... make sure you have a flashlight for your sanity.