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 - New Life for an Old Allis - by Tyler Woods. My friend Jon, has an old '39 Allis Chalmers B. He thought it a marginal tractor that had long since served its time. She smoked terribly and never had much power but he couldn't afford another so he was limping along with what he had. Jon's Allis has a small front loader and though it doesn't carry much, it serves his needs. It was the hard starting and low power that made him think it was time to replace the old girl. Jon called me to help him discover why his tractor wouldn't start
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