[Healeys] Hardened seats in a cast iron 100 head

[Michael Salter]

I am still using cast iron heads on both my 100's. Amazingly neither have
serious cracks as are so common on these.
I am really picky and don't particularly like the different sound that a
100 engine with an aluminium head makes so would like to continue using
these cast iron ones.
I'm contemplating installing hardened seats in one.
Hase anyone done this successfully?
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