After we installed it we let it sit at 2200 rpm for 25 minutes. A good friend of mine who is a proffessional, said to set the rpm at the rate it would normally be at going 55 mph, so we set it at 2200 for 25 minutes. Since then, the rockers have needed adjusting. A certain family member of mine isnt convinced that it is ready to take to the dragway for some fun. I should have explained by fresh engine, I meant relitively fresh.