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This started NASCAR’s move away from stock cars and toward specially designed race cars. Three companies were contracted to build and design chassis for NASCAR-Holman-Moody, Banjo Matthews, and Hutchensen-Pagan. Richard Petty’s 1973 Dodge Charger looked almost identical to one that a customer could have purchased at a local Dodge dealer. The cars no longer featured doors, but still closely resembled the on-the-road counterpart. The teams were allowed to adjust the chassis but the body was to remain stock. While the win on Sunday, sell on Monday approach was still a driving factor, NASCAR permitted teams to be more liberal with the modifications made to the frame.
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In a departure from the “anything goes as long as it’s stock” approach from previous years, NASCAR sought increased parity with its new rules package. The year is 1967 and new superspeedways are being conceived and constructed-and NASCAR needs a new generation of car to meet it. The Strictly Stock cars were used until 1966 when NASCAR ordered its first significant competition change to the Grand National Division. Aside from these three outlined modifications, nothing else was permitted to be done to the car. The third and final permitted modification was the use of heavy-duty rear axles, which were intended to prevent rollovers. NASCAR eventually mandated that the doors be bolted or welded shut-providing the genesis of entering through the window.
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Given they were customized street cars, the doors were a massive issue for driver safety. This was the only generation of NASCAR race cars to have actual doors. This means that essentially, when a driver purchases a car from the dealer, no modifications could be made to the car’s body and frame. Three items were mandatory: Each car needed to have a strictly stock body and frame. NASCAR saw countless manufacturers participate from Chevrolet to Chrysler, Volkswagen and even Jaguar. What is now widely considered as Generation 1 debuted with the sanctioning body in 1948 and resembled nearly identically the on-street counterparts.