Quote Originally Posted by Zombiebrew View Post
No that's great! What if I put the zinc additive in and it's not a flat tappet cam. Can adding high zinc cause any problems?
Nope, zinc & zinc/phosphorus are good stuff, focused on high pressure wear zones. Adding Zinc, or running the oil with high zinc is not a problem for any engine, but it's become all but mandatory for flat tappet, non-roller lifter cams.