Does anyone have an opinion on the strength of the stock bottom end of a 2013 Ford F150 5.0L? I have a truck here with a Roush stage 2 kit on it. They market it as 570-ish hp (crank). Owner is looking to squeeze some more out of it. I know VMP sells a pulley that fits but I don't want to stress this engine too much if it's already tapped out. Any thoughts or experiences would be appreciated!!