351 forged or not?

I don't think that they do come forged. I would say if they don't give you the option, or don't say explicitly that the pistons are forged, it is safe to assume that they are close to the cheapest pistons available.

The mass rebuilders that sell to chain places like Advance and PepBoys almost always use the cheap cast pistons, especially on an American V8. I doubt they would even bother w/ hypereutectics since they cost more and would eat into their profit margin. If you want forged, you have to buy a motor from a source that specifically advertises forged pistons, like Ford Racing, CHP, D.S.S. or whoever.

As far as I know, none of the factory-based 351's got frorged pistons only 86-93 5.0 h.o.'s did.

I bet the lighting 351w were forged but other then that perhaps the 1995 cobra r in the mustang would have possibly been forged but hyper for sure. Other then that i think you will just find cast pistons.