Superstocks (previously known as A Grade Stockcars) are a premier class of New Zealand Speedway (dirt track racing). Cars are of bespoke design with integral roll cages built to rules provided by Speedway New Zealand. Superstocks weigh 1,400 to 1,500 kilograms (220 to 240 st; 3,100 to 3,300 lb) and are usually powered with modified production car engines of up to 248 cubic inches (4,060 cc). Contact between cars is allowed and is intended as part of the class.
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