Tractor Vet, you are correct if you mean the 93 octane by the research method. The current (R+M)/2 93 octane is 100+ by the research method. I owned a 66 Plymouth 383 with 4 bbl carb. It ran on the mid grade at that time, don't remember the exact octane. Regular was too low, Super premium was not needed. That engine did not have a compression ratio as high as the Ford 390 or the GM 396. I traded that for a 1972 Chevy Monte Carlo with 454, unfortunately the first year GM dropped the compression ratio to 8:1 from 10.5:1 or so. It did not accelerate nearly as well as my 66 Plymonth, when the previous year the 396/454 would leave it in the dust. It also would ping on unleaded regular if I went from the 2800 ft altitude where I live now to the 500 ft or so where I grew up. Going to quit, this is not about tractors.
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Today's Featured Article - Maintaining Rubber Tires - by Staff. The broad use of rubber tires on farm tractors and machinery has resulted in a great saving in both time and operating costs since the time of steel wheels. There are, however, certain basic fundamentals in the care of tires that should be followed carefully if the owner is to derive maximum benefit from his or her investment. First and most important is to maintain proper pressure for the work at hand. Your best guide to proper inflation is the operator's manual or instruction book tha
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