"Smokers only please" in the Pro Stock division.
Aptly named, this class is truly professional as the
craftsmanship in these mighty oil burners is second to none.
A single turbocharger, bigger displacement (680 C.I.D. maximum),
and smaller 24.5x32 tires separate pro stocks from
their cousins in the super stock division. The growl of the
engine can be heard over the sound of the turbo as
pro stock tractors charge down the 300' clay surface.