IMO, it depends. IF all I am doing is building a 100% street car just for cruising and having a good time with, while I do look at valve events, they are not my end all be all guide. No way. No how. It's real easy to get caught up in "paralysis by analysis" looking at too much. Now a race only or hot dual purpose car, I'll spend some time on. But something for the street? I make a decision and go have FUN!