hi, ok, first off, if you use schubeck lifters, they will seat without worrying about flat lobes. if you replace them with regular lifters, then you will have to break in the new lifters. in breaking in a cam, it's the lifters that develop a wear pattern. they are the weak link in a motor. the schubecks require no break in time. best to use outer springs to seat the cam and lifters. If you think about it, schubecks can be used on any cam. that proves the lifter is the problem in break in. just food for thought.