OEM seats ground directly into the head were induction hardened. It's a spot high-frequency heat process. Deere, Ford, GM, et. all used the induction-hardening process. Problem is when doing a valve job with a seat cutter or grinder - that hardness is often lost. It's not very deep and you feel it when you grind through it.
Supposedly - an engine previously run on leaded gas and then switched to unleaded does not have a big problem. That because of a chemical-metalurgical process that occurred with the leaded gas. It causes a "self-hardening" of the cast iron seats. The big problem - as I understand it - is when that hardness gets ground away during a reseat job and then only unleaded gas is used.
A few posters have asked why engines run on fuels other then gas don't suffer? I'm not sure but I do know that burning gasoline creates iron-oxides that act like sandpaper on the valve seat. I suppose other fuels don't create the oxides to that extent?
Now with my 1010? Hey . . . I got 10 years out of it before trouble. Chances are I'll never use it this hard all-at-once again. I'm not even sure I'll be "running" in another 10 years.
I'm just going to loosen the valves and put back together. I'm also hoping the seats might "work harden" a bit.
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