I know the stock head studs are good to about 45 pounds of boost but im more worried about the limitations of the lower end ive searched for alot of this already on here and havnt found it if it has been posted before i aplogize for not seaching well enough. But im intrested in knowing the limitations of the stock internals such as crank,rods,pistons,point of sleeve ovalization so the torque, horsepower, and boost capabilites. Sorry for the bad spelling in advance. Thanks for the help.