Looking to identify what pistons I have in my 455. I know it's a 70 model 455 but looking at the pistons with a borescope I can't find any notches, v or half moon. Only thing I can find is arrow pointing towards the front. Starting to think it's aftermarket. Lots of crosshatch in cylinder walls. In the following picture also found something concerning that I have no idea what it is. Maybe some kind of carbon buildup break off? Low milage engine since rebuild with restoration. Cheap $15 borescope with my phone.

 

Aftermarket pistons, so no way to know.