THis is what happens when a valve REALLY smacks a piston The
cause of this was a seized valve guide in
a 1978 Euro motor. The engine was sold fore a core with parts
to repair it (head, spray bar). The piston was OK.
Smmmmack! Yeah....not good.
Head was destroyed as well...
I shoudl have taken some more pictures. The rocker had broken
and taken out the spray bar. The cause
of this appears to have been a seized valve guide.