I think I already know the answer to this, but this was the spare head I planned on using on my '85-til I saw this. Is this now a paperweight? I'm thinking it's shot. This is where a lower stud passes through just below #2. More pitting right next to it. The head that came off is razor sharp around the edges, so it is looking like it will be going back on, but it has a chunk missing around one of the front exhaust studs. Hopefully I did this right, I did make it public.

https://plus.google.com/photos/106005770038938396483/albums/5980762725498000049?banner=pwa

Jeff Stewart