A lot of thermostats come with a small hole, but not 1/8th inch . More like .050 or less. The 560 will air lock but the bleeder valve discussed here always has released the air for me. On other models I often loosen the temp gauge to let air escape but this is normally on an engine I have just assembled so it is easy to loosen. On the M and H style thermostats it is pretty hard to get an air lock unless the wrong thermostat is being used. The correct ones don't seal all that well in the housing. Over the years some automotive style thermostats have been installed in them and they do not allow the by pass system to function correctly. Some auto stores still sell the wrong ones I think.
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Today's Featured Article - The 8N and the Fox - by Zane Sherman. Dec. 13 1998, Renfroe, Alabama. Last niht I dreamed about the day that I plowed the field of about 10 acres over on what Jimmy and Dandy called the Ledbetter field. I was driving the 1948 8N Ford tractor that Jimmy bought in 48 new This was prebably in about 1951 and maybe even befor the house was built. This would have made me to be about16 years old and I drove the tractor for nothing and would have paid to drive it if I had had any money which I didn't, but neit
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