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 - Gatherin of the Orange - by Rick Nikolich. In July of 1998 I was talking to fellow Allis Chalmers collector Mike Schilling about the annual "Gathering of The Orange" AC show coming up in August of 1999. He got this wild idea that we should get a convoy of AC tractors and drive them from Charlotte, Michigan 105 miles to LaGrange, Indiana.
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