Unlimited Super Stock (USS) is a class that generates more power than any other “stock” division. From their tube frame component chassis to their highly modified engine, these aren’t your granddad’s John Deere, Case-IH, or other brand models found in agriculture – hardly! These machines can create in excess of 5,000 horsepower weighing 6,200 pounds. Most of the engines have been modified to run on methanol fuel, although rarely fans will see a diesel-fueled Super Stock joining in the fray. Unlike all other forms of stock classes, the alcohol tractors do not blow plumes of black smoke. With methanol pumping through these engines, the USS class has become known for their ground-pounding power and amazing wheel speed. Keeping these bad boys between the lines and settled down is a daunting task for the driver, but the fans can’t get enough of the awesome power coming from these machines.