If i don't have a feeler for the dead middle of spec, i use the next size bigger. I usually check every 30-40k mi or so but could probably go longerNO? Now is a good time to discuss this. What do you set yours at? Many people agree that they do sinch up over time. I just set mine on a compleatly re done head at .012 in. .016 ex. for startup.
Oem spec is
.008" - .010" for intake
.010"-.011" for exhaust