Prop strike effect on resale value?

Ron Natalie wrote:
Mike Spera wrote:

As others have stated, you need to follow the engine manufacturer's
instructions following a prop strike or "sudden engine stoppage".
Usually this calls for inspection of the crank runout at a minimum.
Some call for engine teardown


"Some" includes both Lycoming and Continental.

Ron,

I thought they both had that requirement somewhere, but I was not sure
whether it was binding (via some FAA reg.). Some other fellow posted the
AD for one engine make because of the crank gear. That seems to suggest
that the engine manufacturer's "recommendation" did not have regulatory
weight (or the AD would be unnecessary).

What's up?
Thanks,
Mike