I'm certainly not going to disagree with PilotDAR, who knows far more about these things than I ever will, but I will throw into the discussion an anecdote I heard. There was a certain Pitts pilot who regularly used to take his plane to 9G - the Pitts is rated for 6G which means that nothing important will fall off up to 9G, but you may do damage anyway (the 1.5 over-G tolerance is true for any certificated type, in the US anyway). The people who used to do his annuals said they would regularly find damaged ribs and so on.
And of course one day something important DID come off, and that was the end of him.