[CWizard]

Is there a way to tell if the valve stems are slowly slipping through the keepers with minimal disassembly? Like maybe removing the rocker arms and putting a straightedge across the valve stems and measuring the distance between the bottom of the straightedge and the end of the stem with a feeler gauge? I've done this measurement twice, 300 miles apart, and the data show a clear trend - the valve tips are getting farther away from the straightedge. Is this a valid diagnostic? Also, if the stems are slipping, how do you fix it? AFR 205 heads on a 418 stroker. Thanks.
Thinking I have a problem,
Jerry