LS1's don't need a break in period. Just start beating on it.
As far as the tranny, the most common problem is the driver going from 5th or 6th to 1st when they were trying to go to 3rd.
If that happens and you over rev it(and no the rev limiter won't help) you will bend pushrods which is better than breaking valves. You will notice the clacking if that happens.
Advice: Don't try to be a race car driver. Get used to the tranny, replace the stock shifter with a nice aftermarket one and have fun with your new GTO.
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