[JSeery]

That is why a lot of folks on here are not supportive of test stands!! Ol Ron for one and Walt, etc. The issue is seating the rings, the engine needs a load on it for the rings to seat properly. Go running an engine on a test stand for very long without a load and you will end up with ring problems. Another problem is allowing a new engine to idle both on a test stand or in a car. New camshafts (as well as other components) will not seat properly if allowed to idle, the RPM need to be kept up and varied for at least the first 15 to 20 min. after starting. A lot of cam failures can be traced to improper cam break in.

Now a few questions for you, what is accomplished by running an engine on a stand? Other than assuring it will start and a few minor test what is being accomplished? I would not want to run a new engine on a stand (or a none moving car) for more than a few minutes. Any amount of time an engine is run without a load on it is too much, but there are some practical considerations (as assuring an engine runs).

Ok, now, to break in an engine, it needs to be under a load and not driven at a constant speed. I would want at least 1500-2000 RPM on a new cam and then vary the speed up and down every minute or so. No driving at a constant speed for any extended time and limit idling of any kind until there is some time on the engine.