Are you draining out the radiator only or out the block drain as well?

Sixto
87 300D

I was trying to drain both by having the t-stat removed and using the lower radiator hose. Which seemed to be working pretty well.

When I got started the sun was going down and I did not see a block drain plug. Admittedly, I did not search that much. On my OM616 it is easy to see and pretty easy to get to.