JHC, if the valve covers don't leak, don't fook with them. Lots of other gaskets in there. Want to pull the oil pan and timing covers too? And the guys at the parts store just love tight wads who bone them for a battery and brake pads every two years, needed or not.
I've done lots of work for fleet and construction, they change schit when it's at the wear limit, service point, or broke. They don't get .gov money to do routine crap just because the calendar and some jar head says it's time.
If you HAVE to replace valve covets every 50k, get a vehicle with hydraulic lifters.
