flat tappet cams REQUIRE a break-in which is like 20 mins as you stated, they need to quickly make their wear patterns
roller cam needs no special break-in, roller parts (lifters and cam etc....) dont need to make wear patterns, they dont wear.....
so you can buy used roller cams and use them with your own roller lifters and it will work....
roller cam needs no special break-in, roller parts (lifters and cam etc....) dont need to make wear patterns, they dont wear.....
so you can buy used roller cams and use them with your own roller lifters and it will work....