if i remember correctly, the seats were induction hardened. replaceable seats as we know today, came much later.

If you plan on using a stock head make sure it has hardened valve seats! Running unleaded (today's) gas will do this to the head.(ask me how i know)


Depending on the casting/year you can tell if they have hardened seats or not. I believe most heads past 73 had them but don't quote on it.

Exactly , Mopar didn't put hard inserts in.

just a side note on valve recession using unleaded gas with cylinder heads not having hardened seats.
i have seen quite a few over the years after tear down that looked remarkably good. these came from engines that were driven reasonably normal, and not beat on every time out.
i have also seen heads from engines that were beat on frequently, and the seat areas weren't as bad as i thought they should be.
with that said, several times over the years it has been suggested mopar used a better grade of cast iron than ford or gm, and that explains why the seats weren't pounded out like i expected they should be.
how true any of this is, who knows ?
i have seen beat seats and junk guides as well. just my life experiences playing with this brand.
your mileage will vary.
ever