I picked up a 3.4 from a shop who had removed it and taken it to bits. It looks like the crank and rods/piston assembly has been sat on the floor and has slightly marked the pistons...though I think some is engine use also.
On this one you can see the lighter areas where it looks like some coating has worn away? Also a few vertical scores though you cant feel them with a finger nail barely.
This one similar lighter areas with some deeper marks from the shop floor...schmucks!
This one similar
Ignore the grit and mess on them....they need a clean!
Can they be lightly cleaned up with fine emery, or are they paper weights?
Thanks