The ports on my Athena kit look already chamfered:
I'm comparing it to the sharp edges on my doomed DR kit that I did not chamfer at all ...
You can see in the pic where a wrist pin clip caught-up and snagged the piston to a grinding halt.
One spot that looks a bit weird on the Athena though is about half-way across on the skirt (blue circle).
Don't know if edges down there matter but I was planning to buy a cheap dremel and a rounded diamond bit or grinding cone and chamfer those. Also heard it can be good to do a 2nd pass with fine sandpaper or even a felt wheel and buffing compound.
Do these aluminum (but Nikasil-lined) Athena cylinders also need port chamfering?