1.   The Stock class is for tractors with completely stock motors. You can dress things up a bit, and if you don't mind spending a little money, you could add ag tires, aluminum wheels, a chrome straight pipe or even turn a Cub into a Deere with a different hood. But ya can't touch the motors, they must be BONE STOCK.

2.   Add a billet steel flywheel, unhook the governor, and you're ready to enter the Sport Stock class. If you want to go a little faster than Stock, but don't want to bust the budget, then this is your class.

3.   The Stock Altered class is for motorheads or boys with fat wallets. If you can't resist the urge to make it go faster, if ya just gotta tinker with the motor, then this is the class for you.

With the above in mind, you can go on to the LETTER of the law, by checking the details of each class in their respective rules section. So pick yer poison, and enter the appropriate class.

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