Stock Super Stock

 Super Stock cars may look like ordinary passenger vehicles, but they are highly modified race cars. The category features primarily late-model sedans and vintage muscle cars, and entries are classified using a system that divides factory shipping weight by NHRA-factored horsepower. Significant engine modifications are permitted, but the vehicle must retain the correct engine block, cylinder heads, and carburetor. Cars are handicapped using an index system, and the breakout rule is enforced (source – NHRA). Stock Super Stock is run as one class in Europe, while it is run as two separate classes in the US.

Stock cars are similar to their big brothers in Super Stock, but the rules regarding everything from engine modifications to body alterations are much stricter. Virtually any car is eligible to compete, and entries are classified using a system that divides factory shipping weight by NHRA-factored horsepower. Bodies must be unaltered and retain a full factory interior. Tires are limited to a maximum nine-inch-wide rear slick. Engines must be correct for the make and model vehicle and must retain stock cylinder heads, intake manifold, and carburetor or fuel injector. Modifications are limited to a basic balancing and rebuild with only a few performance enhancements. (source – NHRA)

 I Sverige körs Stock Super Stock i en gemensam klass, medan det i USA körs i två separata klasser. Klassen är uppbyggd kring NHRA:s regler. Där specificeras klassen bland annat som: För 1960 eller senare årsmodell fabriksbyggda personbilar och vissa sportbilar. Alla bilar måste vara fabriksbyggda och tillgängliga för allmänheten via bilhandlare. För stock gäller det att man tillverkat minst 500 bilar av aktuell modell och för Super Stock är det minst 50 bilar som gäller.