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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