Did I read that you just had the heads done?
Ooohh k! There's hope, best scenario would be spring broke, valve is just off the seat enough for the no compression reading, worse case would be it pitched the valve into the piston bending it and hopefully didn't bust the piston.
Ahhhhhh, and you're gonna pull the head, or did I say that already?
Show us what you find. Some of us dig mechanical carnage.