Rocker arms for 408 build
Have replaced a few broken stock type rocker parts from hard use. In each case it was one piece that was weaker than the rest and let go. We don't have the means in the field to detect these. So we just run them and hopefully find the weak unit and can replace it without too much associated carnage. More often than not, breaking rockers are just that.
Story: Broke a spindle in a rally. The wheel was just laying there LOL. The spindle casting had a void in the middle that finally allows a crack to start. Had thousands of racing miles on it. I did not stop using stock spindles.
All this is good discussion.