You'd be surprised what stock chevy chit can take .

-beerjet-

I truly trust stock steel but what about a Scat Eagle etc.?? They all claim there forgings are better and stronger. If I find stock steel i am gonna probably have to have it turned, re nitrited etc. so I am leaning towards the Scat Series 9000 Super Duper Space Age Steel

I haven't heard of any complaints with the Scat cranks, but I've been out of touch on those kind of parts lately.

Ask around a few machine shops. I think some will tell you to expect to do additional machine work to get those cranks ready to use. Quite a few come through with sloppy machining. Just my .02

I talked with a well known reputable engine builder and he said cast cranks and cast rods are not usually a problem until at least 600 HP.

Scat cast steel good to at least 600 HP in jet boat use. Don't get greedy with the timing and compression so you don't detonate it. Detonation and hyper-you-screwed me pistons are the 2 major causes of blown up stuff we see. Never seen a crank fail in a jetboat that wasn't caused by somthing else. We used to offset grind stock Ford 460 cranks (2.5"throws) to Pontiac size (2.250") before the 514 kits came out. That allows the use of stock Poncho rods(we used ARP bolts and beam polished, and shotpeened them)and 403 Olds trw forged pistons. Depending on the oversize, you got about 498" with off the shelf parts! We have a bunch of them out in boats, street/strip, and tow vehicles.One has an 8-71 blower with a bugcatcher on alcohol in a yellow Kachina, the last I heard of it, it was still running 7+ years later! As long as there is no detonation, these live forever, and its an offset ground,STOCK FACTORY CAST crank! Moral of story: make sure the oiling system is up to the task,the clearances are correct, don't detonate it, and no problems.  TIMINATOR