Let me quote John  Schwaner on page 83 of the  Sky Ranch Engineering Manual; 
"Each time the rocker arm tries to open a stuck valve you risk catastrophic 
engine damage." snip. "Tremendous valve train forces develop as the camshaft 
lobe tries to force the valve open. When operating normally the highest loaded 
surfaces in the engine are the cam shaft lobes and additional loading may 
induce failure." snip. "A damaged camshaft lobe requires complete engine 
removal and disassembly."

Piston engines. sheeesh.  You can have them :-)

Paul Lamar
 
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