Assuming that you are not having problems because the cam is shot, in order to have the best chance of successfully using new lifters on an old cam, you have to treat the whole thing as a new motor, that is you have to coat the new lifters with cam break-in lube, fresh oil with the zinc additive, BradPenn or some equivalent, would not be a terrible idea to preoil the motor, and then break the cam in just like it was new, 2000 rpm for 20 minutes or so. This does not guarantee you will be successful, only that it is what you need to do to have the best chance of success.

Last edited by mdonohue05; 10/16/15 01:35 PM.