[Excaliber]

It is prudent to check the valve clearance on a new engine, that is, 1,000 to 2,000 miles. If any valves actually need adjusting, repeat at another 1,000 miles! There is virtually no reason valve adjustment should change significantly, a couple to a few thousands at most. If the valve adjustment is changing dramatically, something is really wrong.

Checking the torque on a rocker shaft, while certainly a good idea with a new engine, should not have to be done on any kind of regular basis, alloy or iron. Like the valve adjustment, it's either going to hold, or not. If not, you gotta a serious problem.