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 - Trenching With a Plow - by Staff. Introduction: This interesting information came from one of the discussion forums here at YT. We thought we should place it up front so it could be read by anyone interested in putting old iron to work. [Editor] I tried something new today, and it worked so well I thought I should post it - in case it might help someone else. I'm running 100 yards of 4" drain pipe from the gutter downspouts of our house to a pond down the hill. This should hel
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