Lots of thermostats are junk these days and a lot of them are cases of wrong thermostats are being sold as replacements for engines that they are not designed for. A good example is the Ford 351C/351M/400 engines. The original thermostats had a hat on the bottom of the thermostat which covered up the bypass which is cast into the intake. All your parts stores call for the same thermostat as the 289/351Windsor/429/460 engines. Those thermostats do fit but because they do not block off the bypass when the thermostat opens the engines run hot. I have a 1978 F150 with a 400. My solution was to buy a whole box of NOS Robertshaw thermostats. They were made in Knoxville TN and are properly designed.
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Today's Featured Article - History of the Nuffield Tractor - by Anthony West. The Nuffield tractor story started in early 1945. The British government still reeling from the effects of the war on the economy, approached the Nuffield organization to see if they would design and build an "ALL NEW" British built wheeled tractor, suitable for both British and world farming.
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