Bob Engelhardt on Mon, 19 Mar 2012
21:24:15 -0400 typed in rec.crafts.metalworking the following:
Oh, yeah ... broken valve. It's right there, embedded in the head. The
surface just looked so molten that I thought "heat". And I did take
them for casting stock. I didn't appreciate the special-ness of the
alloy, but I knew that I could use them. I didn't see the rest of the
engine & it's had to believe that it could be repaired. It could still
turn up.

All Depends. I know the old VW engines, when this happened, we'd
ordered a replacement head and pistons, then inspected the cylinder
for gouges, and then some times cracked the case to look for "stray
bits" of piston etc.
So the rest of the engine might be in use.
--
pyotr
Go not to the Net for answers, for it will tell you Yes and no. And
you are a bloody fool, only an ignorant cretin would even ask the
question, forty two, 47, the second door, and how many blonde lawyers
does it take to change a lightbulb.