Only mods to the truck are the roush blower as it was shipped with the roush CAI and a set of headers and full exhaust. MY question is how hard can this motor be pushed before I have to start worrying about block failure? I've heard a few storys about these blocks being sorta weak and prone to failure this truck only has 27K miles on it so its still fresh. Right now I'm at about 360ish WHP on my mustang dyno. How do these motors like the cam timing? I know some motors seem to like it more advanced and others seem to like it more retarded and how much is too much? How much play room do I have before the valves start getting into the pistons?