I need some advice breaking in new cam and lifters in fresh rebuilt short block. Paper work that came with the motor says to add a bottle of zinc to the oil and change the oil after the first 2 hours. Add the second bottle of zinc after changing the oil and change oil again after 20hrs. Do I have to do a certain break in procedure for the cam? I remember having to run new engines at 2,000 RPM for 10 min or so to break in the cam.