If the 87 octane on the pages you posted were produced today, the R+M/2 currently in use would say about 83. So, the 87 on todays pumps is higher octane than the 87 octane recommended in 1958. The research number used in 1958 goes up to 91 or so due to todays higher octane regular gas. If the R octane was still 87, use of R+M/2 with a M of 77 as you stated would be 82. I don't know what the M rating was in 1958, though. I think I just said that today's gas is better than it was in 1958 -- I'm probably going to get in trouble. But as far as I'm concerned, it is. Unleaded gas burns cleaner than leaded, and the quality control is better than it was 50+ years ago.
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Today's Featured Article - Fabrication (Who Me? Make it myself?) - by Chris Pratt. First of all, what are the reasons for not fabricatin your own parts? Most judgements on what should be purchased rather than fabricated stem from: Originality - If the tractor restoration is to be 100% original, it is likely that you should spend the time and money to locate the component in the used or New-old-stock market. Since this can be extremely difficult, you may want to fabricate the item or purchase a modern replacement temporarily, but eventually, you s
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