I'm changing the coolant right now in a 88 rx7 turbo II... where is the engine block drain plug? does anyone have any pictures too?

 

Everything you need is covered in the service manual. Follow the instructions. Note that you will need distilled water, which you can get for less than $1/gallon at any supermarket. Also, if you have trouble with the screwdriver-type radiator bleeder screw and drain plug, note that you can replace them with the better "wingnut" type that you can remove and install with your fingers. The bleeder screw and radiator drain plug are the same size, so don't let the diffrernt names confuse you.

The manual is on both of these sites.
http://www.iluvmyrx7.com/
http://www.fc3s.org/

 

The engine block drain plug is at the bottom of the oil filler tube, right underneath the dipstick, 14mm bolt.

 

Right in amongst the engine mount to housing bolts (it kind of looks like a fourth mount bolt on the drivers side