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The short answer......money got involved.
You see it now at all levels of racing. I remember in quarter midgets when you needed to have a Ti rear axle and a new set of Vega tires every week if you wanted to be competitive.
Then came 1000cc midgets for us. If you didn't have a bulked up motor and a $2000 set of shocks you weren't going to run up front......and those motors were still considered stock.
As someone mentioned. It's hard to compete on pavement without a car designed for pavement and a couple of new sets of tires for each race. That's a lot of $$$$.
And finally, just look at what money has done to NASCAR. Would you rather watch a parade of identical cars going in circles at 200mph or cars going 180mph and actually racing each other?
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