Quote:
Originally Posted by undy
As mentioned, the valve probably kissed the piston and bent the valve stem when the spring broke. You may have piston, block and cylinder head damage. You'll have to pull the offending head and inspect for damage.
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If you have access to a bore scope, poke inside the spark plug hole
for indications of obvious damage but as Undy stated you're looking at
pulling that head to be sure.