(N)ot A (S)port for (C)rybabies or (A)thletic (R)ejects
"Legit" stock car racing ended in 1949, a few hours after the first race, when drivers and owners started trying to figure out how to stop them from breaking.
The end of Detroit "iron" came during the turbulent 70's, when manufacturers were jumping in and out the sport with regularity.
The final nail in the coffin occurred when cars built by Edwin Keith "Banjo" Matthews in a suburb of Asheville, N.C. won 262 of 362 NASCAR Winston Cup races from 1974-1985, including all 30 races in 1978, and four consecutive Winston Cup championships (1975-78).
Under the skins of any manufacturer, the cars were identical, except for the engine and the teams that raced them.
The only people to have ever seen a “legit” stock car race were in the stands in Charlotte in 1949, but since the winner was disqualified for cheating, was it really “legit”?
It is true that NASCAR does not write rules, the participants do.
Years ago, the "rule" book contained some parameters surrounding the fuel line as in length, routing, couplings, material. One enterprising person noticed a parameter was missing in black and white. The diameter. He used this oversight and installed a 2" line that would hold enough fuel to outdistance the field.
He watched as NASCAR inspected his car, finding nothing. He asked if they were "happy now", receiving an affirmative, and with his fuel tank on the ground, hopped in and drove it away. "Smokey" always enjoyed yanking "Big" Bill's chain.
NASCAR looked again, finding the "innovation". The next day all the teams received "Smokey's rule" regarding the diameter of the fuel line.
Smokey also “wrote” the template rule, the weight rule and the minimum allowable sheet metal rule, among many others.
The roots of the COT stretch back through 30 years of NASCAR having to regulate such things as roof lines, deck lids and spoiler areas in order to keep the field as level as possible and the incessant whining from the participants that X has a perceived advantage over Y.
Safety was of course a consideration and the death of an Icon certainly accelerated the process but it was coming regardless.