Found my dads original 1971 duster!

Ya. Again, I don’t know a lot about engines. His explanation to me was that there was no way they could have known. He gave me the old head to bring home. I was actually thinking that I hope it didn’t get too hot. But I just assumed they’d know what they were doing and it would have never gotten to a point where it would be hot enough to cause any issues. But again, I don’t even really know how engines work. Being honest
I totally understand your point and that is why you paid them a PREMIUM for a rebuild.
I would be asking some questions, Heat will wreak havick on a flat tappet cam and especially one that is not broke in yet.
What kind of warranty did they give you?