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 - Ford N-Series Transmission/Hydraulic Fluid - The Full Story - by Llamas. The transmission fluid in an “N”:-series tractor lubricates the transmission, differential, rear wheel bearings, PTO and hydraulic pump drive, and it also cats as the working fluid for the hydraulic lift. In 9N/2N models, it also lubricates the steering sector and shaft system. The owner’s manual for the 9N and 2N models specified the use of only two fluids. They were STRAIGHT MINERAL OIL SAE 90 (above freezing) and
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