Re: [Healeys] Hardened seats in a cast iron 100 head

[Hank Leach via Healeys <healeys@autox.team.net>]

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<div>I do not recommend that you do hardened seats. Chance of damage to the=
 head is high and then you will be stuck with Aluminum.</div>
<div>There is no need to change the seats just because we lost lead in fuel=
 or that octane is reduced. If you drove the car daily and put on mega =
miles a year this might be a consideration but with today's conditions that=
 probably is not going to happen. The seats will last forever.</div>
<div>Lead to reduce knock was only needed in the early 1900's when ignition=
 equipment was poorly designed. The entire lead fiasco was a ruse by the =
Ethyl industry to sell fuel...it was never needed and finally banned in all=
 but 6 countries.</div>
<div>The "additional" advantage of cooling the =
valves was not much of a benefit and lead substitutes today are just =
alcohol and not really effective.&nbsp; Exhaust valves run at 1800 degrees =
despite lead or lead substitutes. Don't waste your time/money or risk your =
head!&nbsp; &nbsp;See my article in <em>Austin-Healey Magazine</em> Nov. =
2020 "Get the Lead Out!" Hank<br>-------------------- <br><br>From: =
"Michael Salter" &lt;michaelsalter@gmail.com&gt; <br>To: &lt;healeys@autox.=
team.net&gt; <br>Sent: August 25, 2024 at 8:09 AM PDT <br>Subject: =
[Healeys] Hardened seats in a cast iron 100 head </div>
<div>I am still using cast iron heads on both my 100's. Amazingly neither =
have serious cracks as are so common on these.
<div>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.=
&nbsp;</div>
<div>I'm contemplating installing hardened seats in one.=
&nbsp;</div>
<div>Hase anyone done this successfully?</div>
</div>
<div>&nbsp;</div>

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