Eagle 3.58" cast crank, who's broke 'em ?

running a stock stroke 3.310'' Stroke 340 crank cast eagle ... kinda worried about what people are saying about it.. but my motor puts out 440hp no problems so for been in the car since may rev limiter in it bounced it at 5500 rmp would love to port my heads and put bigger cam in it but now i am worried ..