I have a chevy corsica 1994 with v6 3.1. There is a nice knocking sound that isn't constant at idle but with revving it gets louder and fairly constant. We took the valve covers off and found metal shavings in the oil on only one side of the v. We are thinking (could be wrong) that there is a problem with the little push rods or rocker arms on that side. Is there a way to check this?