Grinding, " diesel " noise under valve covers

No eye seen movement, fore. Rear, wasn't able to able to get a bite. But , the " wood block" idea is great! Maybe w/ some ratchet straps, or, something, I can make a " pry point". So , I'm also looking to put a magnet dial indicator on balancer? For.# s? Thanks, Bewy! Hope Y'all are Staying Strong there! Much Appreciated Brother!