I am looking over a an 87 sd
I have owned a few 123 models and have read things about the heads on these 6cyl diesel engines being troublesome.
What things should i look for before purchasing a vehicle like this?

thanks
as far as I know from what I have been told on the phone it is an 87 with 189k on it.Will drive tommorow and want some things to check to make sure if it is a dud or not.