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 - Memories of a Farmall C - by Monty Bradley. When I was a child, my grandparents lived on a farm owned by a Mr. Walters. The crops raised were cotton and soybeans, with about forty head of mixed breed cattle. Mr. Walters owned two tractors then. A Farmall 300 on gasoline and a Farmall C, that had once belonged to his father-in-law, and had been converted from gasoline to LP Gas. Many times, as a small boy, I would cross the fence behind the house my grandparents lived in and walk down the turn row to where granddaddy would be cultivati
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