To me stock is whatever was available on that model tractor when it was new, or was made available from the OEM as an upgrade.
For instance, I would consider a Farmall M with oversized, firecrater pistons as stock. A Farmall M with the sleeves removed to run a greatly oversized piston and the crank worked to gain stroke is not stock. A Farmall M with a 450LP head on it running on racing gas is also not stock in my book.
One way to keep them somewhat honest is to have them hook to an appropriate plow or heavy disk and pull it through a field for a couple hours. The heavily modified engines generally can't survive that, they are made to run for 300 feet only.
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Today's Featured Article - The Rescue of a Fordson F - by Anthony West. Introduction I live in the UK and have for many years restored Fordson tractors (in the main model N's). I have also restored and shown model F's, E 27N's, Field Marshall Series 2, David Brown Cropmasters and the old rey Fergeson T 20. At one time I had seven restored examples which were shown and used in ploughing matches. As most restorers, I have a number of war stories I can relate on a range of topics that may help other like minded and interested people. Perhaps my first p
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