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 - History of the Nuffield Tractor: Conclusion - by Anthony West. In the last piece I mentioned that Nuffield had reached the stage where they had chosen to drop the "Universal" from production. The two new models were given three figure numbers, instead of "three" and "four". Model numbers were introduced to help farmers and dealers instantly recognize the engine size and horsepower of the tractor, the 4/60 had a four cylinder diesel engine which developed 60 bhp at 2,000 rpm. The 3/42 had a 3 cylinder diesel engine which produced 42 bhp at 2,000 rpm. Th
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