Coolant leak -hydro locked engine

Took the heads to my local machine shop tonight and it was quite upsetting at what he found. First he found epoxy in the intake runner when he took the intake valve out.
The epoxy had cracked and started to flake off and under the intake valve it a had .400 thick seat install and below it was a hole!!
My Machinist says he never uses a valve seat over .250 unless that is what was called for by the manufacture. So now my W2 heads are JUNK