[Randy Rosenberg]

I heard recently that Roush dyno's their new motors for only 10 minutes. Given that it takes at least 20 (if not 30) minutes to break in a motor, my humble recommendation is to run the motor on an break-in stand (or dyno) for 30 minutes - beside break-in, this will give you the opportunity to check/fix any leaks, perform an initial tune for your altitude and retorque the heads (if needed), etc... All of which are easier to do with the engine out of the vehicle. Just my 2cents...