In the class that you are pointing out - ADRL Extreme 10.5 - there is no limitation on block or heads. So, why would they limit themselves? If you want a class like that - go create one, because there currently is none at that level. Go create a Factory Stock class and see how much interest it generates.
You are getting pretty desperate. Fact is, the V8s are faster in the very class that you pointed out.






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