intimidator3
New member
My smalltown track is thinking about adopting a 615. Carb rule with a certain jet. Everything else would be legal as long as it is a clone motor. My question is will this nullify modifactions to the motors? Or will the changes to the motors still be worthwhile? I know the carb and airflow make a huge difference, but how big? Any changes that will help me the most with this lone rule?