I don't know about for FE's, but is there not such a thing as a "Cast Steel" crank? I was under the impression there are 4 general types of cranks out there, leaving out anything completely whacked..
Cast Iron
Cast Steel
Forged Steel
Billet Steel
I am still looking for a 7" stroke, billet unobtanium crank for my 351W.
Brent, I know the 351C NASCAR motors ran 650+ HP on a cast crank, don't know if it was steel or iron. I'd imagine with 75 more cubes or so, you'd be able to pump out 550+ HP.
As far as 6500 RPMs goes, that doesn't seem like enough RPM to make a cast crank come apart.
But I am using words like "seem" and "imagine" so go figure.
