I bought the cam and lifters in 2018 and they have been broken in (in another block) so they should be fine. The EDM lifters really help too. I won't run a roller because I make a lot of passes in a year and I can't tell you how many times I've seen someone lose a race or not show up for a round because of a broken roller lifter. The valves were done by Best Machine when I bought the heads.