Don, there are several ways to look at this question. First off, I don't have a dog in this fight, but to my limited knowledge, what engines would you propose using, as DOHC is not an across the board available motor, especially in a V8 version, at least that most racers could/would have access to. Second, if you're thinking of Sprint cars, I doubt anyone would be in favor of it, and if it were allowed, even on a trial basis, I don't think you'd get a big following. Maybe in 10 years, but now, not a good idee. JMO! Bob