Man oh man ! This is confusing. I just went down to the basement and looked at some NOS Harrison thermostats. Some said on the box, 153 degree and run with alcohol base antifreeze and some others are 171 degree and say, use with permanant antifreeze. (I have a 50/50 mix at this time).I have no idea at the moment if my car has them in or not but I feel it ran very hot coming home from a little cruise a couple of evenings ago. Gauge showed normal most of the way home and then spiked the last couple of miles. This engine was completely rebuilt when I got the car about three years ago. The paper work that came with it shows it also has Haneys pumps and taking the pressure cap off when it is running seems to have the flow of a fire hydrant. I am going to pull a hose Monday and see if it has stats in. I was always under the impression that you put those in for the winter so your heater would keep you warm and had never heard of running them in the summer till I came on here. I have been following the comments with great interest and not too crazy about "frying" a nice engine by over heating it.
