Was bored the other night and yanked the valve covers just 'cause I haven't checked any of that stuff in a while. Everything still looks brand new except the #5 intake rocker which has quite a wear line to the right side of the valve tip. Planning to replace it before TWS but I'm looking for root cause theories....I have a couple but not confident in either. I've only ever seen this on blown motors that had debris floating around....never on a clean "healthy" motor. Not sure what to make of it but it looks suspicious....