I found valves with a FoMoCo (Ford motor company) stamp in my heads. Seem to be old stuff, but are these the (so) vulnerable two-piece ones or? Can't find much info on these...
you need to bannish them to the recycling bin forthwith, and count your blessings that they made it there intact
but they do make for nice seat-savers if you're going to polish the combustion chambers, grind the top edge down to a taper that will allow your polishing tool easy access to the areas surrounding the seats... you only really need to taper 1 intake & exhaust
they also make for good jack stand pins, engine stand rotation pins... i suppose the list goes on
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