Well being and OLD Ford mechanic/ TECH that worked on them OLD engines since it is a 331 and NOT a 330 then yes it has sodium valves as all the H D engines had , they were used for the Heat generated . Only problems i ever had with any Ford valves in H D app. was with one company as they ran a fleet of Ford Tandem and Tri Axles DUMPS local and back then the required fuel for the OLD gas powered trucks was HIGH TEST of 105 or greater octane . Sohio gas there high test was called Boron with valve cleaner and it did a fine job of cleaning valves . some weeks Pualey had two down . He ran the 391 H D as the smallest up to the 534. The Boron did not discriminate as it ate them all . Till i got him to switch gas then the problems went away . As for your valve springs i personally would not worry about the springs as much as rust on the valve stems and in the guides . The sodium valves have larger stems . YOUR big worry will be the Carb and gas to run it on . Carb problems will be the Power valve and the acceleration pump , they do not like gas with ALKIHOL .I can not remember every little detail of the tune up spec.s since the last one i worked on was like fifty years ago.
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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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