[niles]

Olie:

Need much more info before any conclusions can be drawn:
they look like stock Ford rockers?
what kind of cam are you running?
Important- what springs are you running -static preload?
What RPM were you running when failure occured
Important- Is valve bent; have you run a compression check on that hole?
Fill in this info and a diagnosis and possible failure cause can be developed.
gn