High Quality Content by WIKIPEDIA articles! Pro Stock Drag Racing is a class of drag racing featuring 'Factory Hot-Rods'. The class can be known as "all motor," as the cars cannot use artificial induction such as turbocharging, supercharging, or nitrous oxide, and there are very strict rules governing the modifications allowed to the engines, and the types of bodies used. The National Hot Rod Association Pro Stock class emerged from the production-based Super Stock class in 1970 with a more liberal set of rules and an absence of handicaps. Rules initially favoured big-block V8s but by 1972 had changed to favor small-blocks to reflect contemporary trends in the American auto industry. In 1982, the NHRA implemented a new engine formula that allowed the big-blocks to return, due to the popularity of the Mountain Motor IHRA Pro Stocks with unlimited displacement in the late 1970s. However, NHRA still limits the size of the engine to no more than 500 cubic inches(about 8100 cubic centimetres) in displacement.

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