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Interesting comments.
A perfectly built race engine should run like hell during the race and fail on the way to the winners circle.
We used to drive the snot out of a new engine to see if a rod or main bearing would fail. Better to know before a race than half way through. Now we use an engine dyno. Remember everything on the race engine is checked and rechecked before during and after assembly. {Only able to do this when someone else is sponsoring you.}
A gentle break-in is a better way to get everything seated for a long life. Car manufacturers will be wanting a gentle method for obvious reasons. I do know a few guys that run them hard figuring that if it brakes it is under warrantee. Today that is not as good an idea as many computers now record how you have driven the car.
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