Yeah, could have phrased that better. Thought i read somewhere about the chamfer on top of lifter bore and it's varying size, and possible oiling issues w/ hi lift cams. Maybe that was only with retrofit roller lifters in non-roller blocks. Specifically, would there be any issues running lets say a.550ish lift cam in a 360 roller block using all fact. hydro. lifters/link bars/spider, and aftermarket rockers with proper geometry? I assume these would have come with a fact. cam w/ lift no higher than the low .400's, in trucks and vans.