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pro stock
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.
==History==
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 favored big-block V8s but by 1972 (after the Sox & Martin Hemi cars captured the first two prostock titles handily) had changed to favor small-blocks to factor out the Chrysler Hemi cars. 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 8,194 cubic centimetres) in displacement.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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