850 Pistons

I posted recently about cylinder not firing and oil coming out that exhaust. I pulled the head off and am going to ship to a recommended shop to check out.
I started cleaning the coke off the top off the pistons and it’s obvious where a valve has hit one of the pistons earlier in its life. Both the pistons are marked with an “A”. Would these be original pistons. I’m wondering while I’ve got the head Off should I at least change the rings and maybe the pistons.

Inspect, measure,observe.

Hola,

Cuando abrí la cabeza en un cilindro puse una A y en el otro una B

If you suspect the rings then yes, if its confirmed the rings are not the culprit then leave alone.