I was looking at a PAW advertisement the other day
.... they had several rebuild kits available for many different Chev engines.... if I remember correctly they were showing
1. rebuild kit w/cast pistons
2. rebuild kit w/forged pistons

One of the listed engines for forged was a
235 L 6.... although I have not called them to
confirm they were showin forged slugs for the 235
....I want to say 292 also....so maybe the
forged do exist...PAW used to offer their own
"house brand" camshafts...their house brand was called Super Stock Industries...and their cams were priced less than a Comp or Isky... so perhaps they have their own house brand forged
slugs... or just have better resources than we do here in parts gathering.....
I HAVE NOT CALLED PAW TO CONFIRM OFF THE SHELF
FORGED PISTON AVAILABILITY....but will if I remember to tommorow... their website was pretty much useless without a catalog.. was trying to see if the forged I-6 pistons were listed online..