[Mark Lewis]

Do not know the details of the valve train in Don's engine. Valve lift could have checked good by the builder. After some runs, do not know how many, there could be a rocker arm stud that has bent or flexed enough to cause a different reading in the cam lift. Been there and done that, just did not get the t-shirt. Had 2 lobes that were .015 short and Holt decided he wanted to check 1 more lobe. Guess what ,.002 too much. Tapped the stud with a hammer and set up again and it checked below spec, although too late. There are variables that could give the wrong reading beside the lifter.