When i lived in Ms. around 2003, i had a friend with a 434" motor, break 2 4" cranks (same engine)on the 1-2 jurnal. Fortunately he caught both before the rest of the motor got trashed. 1 crank came out in 2 pcs. We only lived 45 min. from Eagle, they blamed it on a bad batch of heated cranks, but replaced both no questions ask. I've used Eagles for over 10 yrs. no problems. I've also been in their shop and they have improved in the last 5 or 6 yrs.
JMO
Zip.