Editing Pro stock (section)

==History==
The [[National Hot Rod Association]] pro stock class emerged from the production-based super stock in 1970 with a more liberal set of rules and an absence of handicaps.<ref>{{cite web |last=Kommel |first=Dave |title=Gallery: The Best of 1970s Drag Racing |url=http://www.hotrod.com/articles/gallery-best-1970s-drag-racing |publisher=Hot Rod |date=25 April 2017 |access-date=18 July 2019}}</ref> Rules initially favored [[big block]] [[V8 engine|V8]]s with [[Chrysler Hemi engine]] powered cars winning the world title the first two years. The NHRA attempted to balance the playing field for 1972 and introduced rules allowing for small displacement V8, compact cars carrying favorable weight.

On 1 July 1973, the NHRA required pro stock drivers to have competition licences, just like blown or fuel [[Dragster (car)|dragster]]s and [[funny car]]s.<ref name="Burgess">{{cite web|last=Burgess |first=Phil |title=The Time Machine: 1973 |date=17 August 2018 |url= https://www.nhra.com/news/2018/time-machine-1973 |website=NHRA.com |access-date=18 July 2019}}</ref>

Following a 1973 NHRA rule change to allow records to be set at any national meet, at the 1973 [[NHRA Winternationals]], [[Don Nicholson|"Dyno Don" Nicholson]] set the first official pro stock e.t. record with a 9.33, while [[Bill Jenkins (drag racer)|Bill Jenkins]] turned in a record {{convert|148.76|mph|abbr=on}} speed; later at the same event, Nicholson made a 9.01 second/{{convert|150.50|mph|abbr=on}} pass, breaking both his and Jenkins' records.<ref name="Burgess"/>

Over the 1974 and 1975 seasons, [[Bob Glidden]] became the first driver to win two pro stock championships.

In 1982, the NHRA did away with the weight break system and implemented a 2,350 pound minimum weight, 500 cubic inch maximum rule across the board, due to the popularity of the Mountain Motor [[International Hot Rod Association|IHRA]] pro stock cars, which have unlimited [[Engine displacement|displacement]]s.

[[Lee Shepherd]] won the second of four championships in a row in 1983, the year he also won IHRA's title, making him the first driver ever to do so; he repeated the feat in 1984.<ref>{{cite web |last=Burgess |first=Phil |title=Favorite Race Car Ever voting: 1980s and Beyond |url=https://www.nhra.com/news/2008/favorite-race-car-ever-voting-1980s-and-beyond |website=NHRA.com |date=11 August 2008 |access-date=18 July 2019}}</ref>

In 2016, the NHRA implemented a major overhaul to the engine formula. Hood scoops and double four-barrel carburetors were eliminated and replaced by electronic fuel injection, an overhaul designed to reflect modern automotive trends, as all automobiles being produced for sale in North America have used electronic fuel injection for over 20 years.