Agreed. The older gas engines from the 1950s run with very low compression ratios. 87 octane will cover their needs without knock or excessive heat easily. As pointed out by Gary current octane ratings would have measured several points higher back in the 1950s and 1960s.
If you are getting engine knock with 87 octane on a engine with less that 8.5:1 compression ratio you have a problem - and it sure **** aint the fuel. Its only when you get up to 9:4 or higher that octane becomes an issue (with pump fuel) - and usually only with mechanical variable ignition timing.
The Super H in 1952 only had a compression ratio of 6.1:1 and the Farmall 450 only had 7:1 compression ratio - well within the operating range of current 87 octane fuel. Running 91 octane fuel in them is a waste of money.
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Today's Featured Article - The Day Mom Drove the 8N - by Brian Browning. My Dad was wanting to put in a garden but couldn't operate the 8N and handle the old horse drawn plow he had found and rigged up to use with the tractor. Well, he decided to go get Mom out of the house and have her drive the tractor while he walked behind the plow. You got to understand that while my Mom is a hard worker who will always help whenever she can... she had never operated farm machinery before that day. Dad got her out there, explained how the clutch was the same as in our o
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