yes,the grey colo(u)red metal is the cam bearing.there are bearings in every rib the cam goes through.you could probably tap them out with a drift,but replacing them is a different matter.of all the cam changes i've ever done,i've only replaced bearings twice,only because they were competition engines, & both times i had to go back to the machine shop to have the bearings honed to size.pissed me off no end.the bearings also decrease in diameter from front to back,so it's vital you get the right bearing in the right holes.my advice,is if they look good,don't worry about them.