Does my piston need to be replaced?
My engine has been knocking for some time now, I finally figured out the head gasket had blown between two cylinders. I got down to the head gasket today and my analysis was confirmed. Unfortunately, when I took the cylinder head off, I noticed damage to the piston, though there was no debris present. I assume this means this has been true since the previous owners. Judging from this picture, does the piston need to be replaced?