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Vic Piano · 06-14-2017, 08:38 AM

I run Skip's water pumps with no thermostats in all my Flatheads now. I did have thermostats in the '39 CS, using Skip's pumps, the thermostats failed on a road trip, causing the Flathead to overheat and blow a head gasket. At sustained highway speeds, they will run hotter but cool down when I slow down. I use water with one gallon of anti-freeze in all of them.

06-14-2017, 08:38 AM	#20
Vic Piano Senior Member Join Date: May 2010 Location: Odessa, FL Posts: 7,611	Re: Cooling observances and hypothesis I run Skip's water pumps with no thermostats in all my Flatheads now. I did have thermostats in the '39 CS, using Skip's pumps, the thermostats failed on a road trip, causing the Flathead to overheat and blow a head gasket. At sustained highway speeds, they will run hotter but cool down when I slow down. I use water with one gallon of anti-freeze in all of them. __________________ Imagination is more important than knowledge.