The Stockcar class is essentially the same construction and weight as Superstocks, but is an affordable form of racing as restrictions to OEM (Original Engine Manufacturers) equipment keep the class under control and bring more competitors into the sport. However it is as equally competitive as the Superstocks and it comes down to driver skills. Although the engines can be the same make they have to have standard OEM parts. Engines are only allowed 2 Valves per cylinder and roller rockers are not permitted unless they are OEM Equipment. Racing rules are the same as Superstocks and the Stockcars are just as hard hitting as their big brothers are, that is why they are one of the most popular classes in modern speedway today.