as of now i have a set of L31 vortec heads w/ pressed in studs. i'm pretty happy w/ the performance that i'm getting from the heads but now i would like a cam. what the largest lift i can use w/ the pressed in studs. i was looking online and i found where somone had the springs up to .510 lift but the studs were pressed. so whats the biggest i can go w/ the pressed studs.