Stronger Crank? - Stock Forged 3.31” vs. Aftermarket Cast New 4”

The material the SCAT/EAGLE/MP cast cranks (the same chinese casting house, ask any honest vendor) is nodular iron, better than the cast stuff they used back in 68 and they have full radiused fillets. That being said, I would put an aftermarket cast crank squarly between an old cast and a new forged aftermarket piece. Old forged are probably a tick stronger than the new cast pieces but they dont have the stress relieving the new cast ones do. cast Eagles fail (so do others), but look at the HP they are listed for and dont exceed that. The differences I have heard are final machining of the cast blanks. I have an Eagle and it had satin smooth journals, smooth chamferes and dead nuts on everywhere that I could measure with my calipers and mics. Maybe I got a good one.