I am on a pretty strict budget right now (college student) and it saves me a decent amount of money if I retain the lifters that are in the explorer motor. Essentially they're still OEM ford lifters, so do you think the lifters in a 50k mile explorer longblock will be able to handle a performance application or should I definitely get new lifters? Reason I ask is because I have the tools to change the cam without removing the lower intake, but if I have to change the lifters, its got to come off anyway. Any input on this???