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 - Madison's County - by Anthony West. Philip Madison has been a good friend of mine for quite some time. He has patiently suffered my incessant chit chat on the subject of tractors for longer than I care to remember, and on many occasions he has put himself out, dropped what ever it was he was doing, to come and lend a hand cranking handles, or loading a find onto a trailer. Although he himself has never actually owned or restored a tractor, he was always enthusiastic and always around helping with other peoples projects.
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