Eagle crank

The machining is important for bearing life and failure from an overheating bearing but cracks like this that are either design, alloy or most likley heat treat. Too much martensite in the grain structure makes a hard but brittle crank. A stock 440 crank in cheap 1053 alloy with 0.030" ground off of it and ground through the heat treat will hold alot of power and not break. You can do way more dammage with a bad heat treat then none at all.

I hate to say it but if you don't like the fact that only import cranks are available it's our own faults for chasing the cheap parts and running everything overseas and running the american foundries and crank mfgs out of business. I build new model hemis for a living and the only aftermarket forgings available are all imports we don't even have a choice short of a billet. fortunately, the import cranks on the new hemis seem to hold up to 1000+ HP but that could change.

One thing I did notice from the pics of the broke crank is they didn't put an actual radius on the fillet. It's a straight angle fillet rather than a radius which still leaves stress concentrations at the corners and weakens the crank. In this case it's not where it broke but still something to look at.