I have a cast 9000 scat on the shelf at home here yet to use it, I have read and been told good for 450-500 hp
550hp 308 very stout, not sure if Tony has used the cast scat crank.
I like the 4340 STD weight crank, on its 3 Rd freshen up, crack tested and linished a couple of times now and measures up nice,
I ran a BBC with a 300 shot 10 years ago in my hotrod 3200 pounds 8:90 @ 150 mph thing killed the scat steel cranks every 2 years at freshen up (CRACKED) don't know why they were so hard on them, tune up was good.