Ever watch NMRA Real Street? 310cubic inch limit, Mildly ported out of the box heads allowed, and all on a STOCK CAM (or stock cam specs) and ONE power adder. Guys are running in the bottom of the 10s to high 9's....on a stock cam. Granted it allows a power adder but 10s on a stock cam....that takes some power to make it run that good. So i find it VERY easy to believe that they can make that power at the motor on a stock roller cam....