Anyone running an XE274 ?

Not really unless you have a fiber optic camera to stick down in there. Or do you mean by measuring how much the lash opens up? After break-in on my cam it was a little sloppy compared to how I initially set it. But when I set it during assembly it was cold and after break in I reset it hot. Than I did another Oils change at 500 miles and I really didn't notice that any of the gaps changed much but I reset them anyways. I didn't get to drive it enough to get to 2,000 miles before I put it away for the winter so I dunno how much the lash changes with some miles put on it.