Can anyone tell me if these are cast or hypereutectic pistons?
I was told they were hyper, but they don't match the pic of hypereutectic pistons in the Jeg's catalog ( jegs shows the hypers with the valve reliefs in black, and cast pistons as all raw finish). This is a chebby 350... I was hoping there would be a part number engraved on them ( I wanted to figure out the C/R of this engine) , but no such luck...

I bought a "mystery motor" a few months back, and I'm dissecting it before I install it - From what I've been able to identify so far, it's got nice parts, but these pistons are making me wonder?