Assembly time is not the big factor. Making sure the brass rings can do the job today, and for thousands of miles perhaps many years into the future; that is the big deal. Repointing the clutch teeth takes a bit of time too, as does back-cutting the flanks. Putting new bearings in doesn't eat a lot of time either;
But the real time consumer would be converting it to be able to shift at 7000. Now that's a trick that will cost in the neighborhood of 8 hours with hand tools. But I gotta tell you; shifting at 7200 and knowing it will be almost impossible to miss that shift, and knowing it is gonna pop right in, and you are not gonna pump up the lifters and crash the valves, well that is a mighty fine worry-free feeling. Now I can worry about where the finish-line is, and am I getting there fast enough.heehee.
