I picked up my 87 about a month and a half ago and drive it on weekends and don't rack up many miles but I noticed yesterday that I have no freeze plug?! Yet, I have no coolant leak. It also looks like its been missing for awhile since there is some sand and dirt residue in the hole. My radiator has coolant and the reservoir has coolant too...
I didn't think it was possible to have all of the above.