My IH engine service manual, ISS-1040-1, last printed in 1968 says that the gas C221 and C263's have a compression ratio of 7.2:1, LP is not mentioned. The C291, also used in the 706 is not mentioned either, but the C301 which is sleeveless has a compression ration of 7.7:1. I don't know if the compression ratios for post 1968 engines were increased or not. The 460 is the largest tractor I have, the operators manual says to use 87 octane by the research method or 80 by the motor method. (R+M)/2 would be 83.5 octane. Not sure that that low octane is sold even at 5000 ft elevation or so, where the octane requirement is less.
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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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